Lane's: jtallen83 inspired 21.750" 300 AAC Blackouts

[Lane]

28 minutes ago, 98Z5V said:

Why are you trying to mold a charging handle, man?...

Too many reasons to mention Sir. SimonSays Says I need to do this. He redrew the charging handle for me around the same time I did,

 It hurts to extract cartridges manually.

I need the leverage advantage that SimonSays described; and more.

Even with a pistol volume cartridge; friction adds up, fast. 

Still willing to accept any criticism here. 

[98Z5V]

My only question is - would it be so hard from a bolt action rifle?  If there's a huge difference between extracting that same round from a bolt-action, and from an AR with no gas system, something bad is going on here.

[Lane]

Similar in a bolt action rifle. The difference I noticed was the lack of cam actuation in the AR platform. Pulling the charging handle in an AR has to pull out the BCG, push the cam pin off the upper, then allow rotation of the bolt in the lugs, and extraction. There are situations where this doesn't happen, and where a real bolt action seems to have an advantage (rotating the bolt out of the lugs manually). Adding weight to the handle itself could help trickle down through the rest of that system in terms of ease of extraction. I may still want to adjust one or more of the contact areas to make it really work well manually. This won't be a semi-auto capable component anytime soon.

This is also the hallmark of every one of my builds; to build some component that fits a need, or fills a gap, and makes it unique to me. This is furthermore a holdover from the Houston Warehouse testing document. In that case, the neck sizes were right around 0.0005" smaller than the chamber. That's going to be a nightmare metric to hit with a standard charging handle. I also have a clearance issue with the Primary Arms scope and a standard charging handle; so at the very least I want a wider grip area...

My first charging test modification will be; to add a right angled handle to the center rear of the standard charging handle. That will give me a straight line force with some extra leverage. Beyond that; there are a number of other things I would like to try. And really; who doesn't want to pour metal in their backyard?

[Lane]

This is the simplest form of modification in terms of getting a grip. Form fit to my hand; clears the scope in both dimensions, and  has a bit of character. This is probably the last time I'll show this before it becomes metal. There are some details to carve, and checking dimensions to ensure the final product will have enough extra material for milling to spec. 

Not sure how many to pour at a time. At the moment I'm considering only 2-3 to keep the molds small (for easy burnout). It also makes the melt a bit faster; and I've not done a solo pour of this type (or volume) here before... So this is going to be interesting. 

[Lane]

I ordered an analytical balance scale today; capable of 0.0001 gram resolution. It comes with an RS-232 port for computer connection, so it should be a cinch to get it running as an automated system for reloading. But to get things moving, I do plan to trickle loads to begin with. One gotcha on this particular model is that it doesn't offer an option to measure grains. I will need to create a grains to grams conversion chart to start with. Once I have a computer attached, that is a simple calculation to perform on the fly. I also got a sweet deal on that analytical balance; so I'm considering adding the RCBS Chargemaster 1500 to my list. I really wanted to be able to interface with their motorized trickler anyway. Only way I know of is to get one in my hands and probe out the connector. I already know the majority of the pins are the button matrix and numerous grounds; just need to figure out: power, motor drive, and whatever else might be in the mix.

So; I guess it's time to accelerate the rest of this project. I have to record a bunch of measurements still, cast the chambers again; and do a psuedo-final assembly on both rifles. There are quite a few rounds of barrel removals on these to get information about barrel attachment (bedding) options; so to call anything final would be foolish at this point. 

I ordered a neck only sizing die for 300 Blackout. I will wait and see what the neck only sizing looks like; but I already made a dummy that appears to be 0.009" over the chamber size. Not sure if the chamber casting expansion was different than expected; but this brass is on the "too thick for 300 Blackout" list anyway. I consider that a good thing actually; as I do want to end up with tight necks. This dummy was made from random broken .223 brass I had around. I don't see a need to modify reloading dies anytime soon; just need to find brass this thing is going to like. It's definitely time to start thinking about neck turning.

Quite frankly though; I've still been enjoying the opportunity to swing this thing around in short form, it just feels right... It's too bad I can't fill up a magazine like this for ladder loads, but whatever; I bought more 10 round PMAGs to make it easier. Hell; that hexmag is a 10/30, and the floorplate on more than one appears to have been glued in place. Other people report being able to take them apart, but it's just not happening on these. I'm guessing it's a compliance measure, and NY law is very specific about that (these appear to be very legal).

[Lane]

Not a huge update; but the 24", and 21.750" uppers are built; still need to get up the nerve to mill the last few thousandths off the final lower receiver. Then just a headspace check for both. I did notice that the AP upper/BCG is much smoother with a standard charging handle. That is something I want to look into a bit further; and is the reason I was considering other options to begin with. Not everything unlocks like a dream, and with tight cases it compounds quickly... Not sure which component needs to be adjusted, but it did make me think more about barrel shims in the wrong position again. There is something going on here that I haven't nailed down yet...

Too much to think about at the given moment; nearly finished with an in depth re-read of Vaughn's Rifle Accuracy Facts. I also ordered the accelerometers to measure 3 axis of barrel movement in these builds. An interesting note in the Appendix A (Vaughn) about that; he used Phillips 941Ms to both filter, and integrate the accelerometer output. I have a pile of them laying around here; and it took me a while to wrap my head around that integration circuit. What an interesting application though; had to order a bunch of 25 turn (stupid accurate) potentiometers to replicate that part of the design.

The 0.1mg scale finally shipped; but I may well need a real Class 1 (or Class 0) calibration weight for it still. Waiting for it to arrive to test with accurate masses, and see what I get back. 

Had some thoughts about collecting barrel movement data from accurately weighed ladder loads (on paper targets), before trying the accelerometers. The reason to do this is because those accelerometers will retard the barrel movement; and I will have to adjust for that in calculation. I should still be able to match up accurately with both data sets in hand; and Kolbe provides excellent equations for those calculations as well (extra weight at the end of the barrel). 

Have a second set of much nicer chamber casts now. Still not confident in their accuracy for a number of reasons. The shrinkage for Cerrosafe is defined in inches instead of percent; and that shrinkage also depends on pour temperature, and barrel temperature. I measured at 1 hour exactly; but I still don't trust any of it explicitly. I wish I had a caliper I could shove in the chamber...

Might sight in this week if I can get my other work finished up. Still need to make contact at the local range before I can perform some of these early tests. Might as well start on another build too; once these are complete...

[Lane]

I have some revisions to my previous observations about Cerrosafe; but I'll save them for another time. It's recorded and documented in a number of ways, so I will revisit that when I can offer further evidence in the matter.

Analytical balance arrived; and while I don't want to stress about it, it wasn't exactly up to par out of the box. But it was well packaged, and it is functioning up to the specifications listed in the manual. It needs more time to warm up, and then another go with a known calibrated/calibration level weight set. I noticed more drifting than I wanted, but after bumping the sensitivity from extreme down to maximum, it has been rock solid. I think I was able to trigger weight changes by walking across the floor in the extreme setting. The doors were closed tight so I can't image wind is the issue. I suppose it still could be moisture; but even with that much flutter, it's beyond an two orders of magnitude better than anything I had before. There are of course, other variables too; and I'm only just getting started here (static, electromagnetic, evaporation, residual contamination of chameber, etc).

The whole purpose of this was repeatability; and not absolutely insane charge weight divisions. I made a chart (knowing it didn't measure grains on the display), to convert grains to grams well beyond 0.1mg. I simply want to know if it's high/low/middle of the road with those extra digits. 

I've already been through a whole round of weighing things; and I have a rough idea how far off the displayed weight is already. I can operate at a high level without an extreme calibration weight in the short term. I'll post up the math when I have the temperature and humidity stabilized; and run it through the paces. Pretty sure I'll have no problem even with the most ornery powders. Many boxes to make; and I have a Chargemaster 1500 coming in the slowest possible way... 

Finally; I came across another analysis of the cheaper 0.001mg scales I had been using. Sure enough, it came to the same conclusion; that there is a filter programmed in the scale that could be deadly if ignored by a reloader. I intend to prove that out pretty quickly. I had been able to work around it with previous reloading sessions, but the process was pure tedium; as I weighed each charge at least five times (sometimes many more) to get any amount of confidence. 

Accelerometers showed up; but are in moisture sensitive packaging. That means I really shouldn't play with them until I have solder paste, board, wiring; and everything else prepared. I guess some chips tend to break if they absorb too much moisture before the temperature shock of soldering happens. While smaller than a pinky nail; these have very tiny mechanical parts inside, so I guess that makes sense... Thinking this might be a perfect use for 0.936 aluminum gas blocks (custom milled accelerometer mount). 

[Lane]

Still quiet at the range, but might as well post a small update about my amusement with this project. 

Really should have started on the brass prep a while ago. I have only about twenty LC cases ready to load. Another box of 50 that just need a quick trim and final wash, then another 50 waiting for a haircut and full prep. Going to have to start looking for more clean brass when I'm out; the stuff I bought locally was more than 50% Lake City; and the balance was FC that looks good (have some converted but not measured yet). I had long forgotten how much fun it was to swage primer pockets; the pile of brass shavings grows... 

Weighed out the wax for the charging handle casting project. I was quite surprised to find out that they only weigh a few ounces. Even with a gating system, pour cup, and sinker there will only be three pounds to pour total. I can do that no problem, not sure why I thought I would be up near ten pounds with my earlier estimates. I've settled on a recipe for this particular alloy which will probably be unique if nobody tries to disassemble it with XRF and recreate it later. I started digging out supplies for this project and found a bunch of small to intermediate size crucibles I forgot I even had. Next time I have a few dry days in a row it's a go.

Spent a good amount of time placing masses on scales, and recording the numbers. Just need to measure case volumes with water, and run a few final experiments left before I get down to business. Good thing too; because the Chargemaster 1500 is scheduled to arrive tomorrow. That should excite my reloading a little bit; though I'm actually most looking forward to reverse engineering the hopper portion of the unit, and qualifying the included scale before I drop charges.

Since things have been moving around so much, I had free space at my soldering station. I worked up the first two modules for a radio chronograph, with the extra wire on pin 12 for analog monitoring of signal feedback. They were even nice enough to drill two header pin holes not connected to the circuit; so I can solder the wire to one of them. The normal digital signal output would not work because the dwell time of a bullet passing isn't nearly long enough; but on the analog side that's a non-issue. I am still not sure if a commercial product could operate on this frequency; even after reading about it on ntia.gov. https://www.ntia.doc.gov/files/ntia/publications/ntia99-361.pdf At least it's not operating in anyone's specifically listed band; and I don't receive anything locally on the frequency...

So far my plan is to sight in both guns on factory loads, shoot minimum loads to find seating depth, and then begin ladder loads. I still have to prep a carrier board for the first accelerometer, perhaps two if I can find enough parts. Hot air soldering only takes a few minutes once the prep is done. Kind of makes me want a portable oscilloscope, but nothing fast enough is even close to affordable. These will unfortunately be limited to home use for the time being (though Vaughn used to roll an oscilloscope and a generator  to his shooting location for research).

[jtallen83]

I found a guy with a brass prep philosophy that I like, he claims neck tension is the most important thing to get right and skips deburring flash holes and the like. He shoots LR matches and owns a reloading die company;

http://www.precisionriflemedia.com/podcast/2019/3/28/prm-105-whidden-gunworks

looks like he has some good stuff for all those little tweaks people like on ammo;

https://www.whiddengunworks.com/

[Lane]

I'll play that podcast later on when I get in to things. I've read a lot about the business end of cartridge preparation. I never heard a great argument for de-burring the flash hole though. Obviously you don't want brass shavings or accumulation in the hole; but if you're going trough the trouble, why not thread the hole to "swirl the hot gasses for a superior burn"? As long as the primer ignites the powder, I'm probably not going to worry too much. On the other hand: bullet base flatness, neck tension, neck concentricity, neck to chamber interface, neck length, bullet seating off the lands, etc.; all have specifications ranging from tight to out of this world depending on who you ask. 

At the moment; my intent is to give these the best possible advantage from the start, and keep them as similar as possible as I work through the paces. 

Chargemaster 1500 is here; and I've only begun to work it through the basics. I do want to finish soldering some things before I throw powder around. I do have a list of complaints already: The powder drain needs a stop or lock; it spins freely and would be trivially easy to dump the whole load. The draft cover for the scale needs to swing up over the buttons, the sideways nonsense is useless; it would probably work better hiding in a drawer. The display is at the wrong angle for anything but using it a foot away; I can't read it at all set back on my desk where I like it (maybe one of the unknown setting is display contrast?). The weights it comes with are both similar to each other, but light overall. 

Besides the drain issue; those things are mostly trivial. While I haven't programmed the memory slots yet, it seems to have enough features. After reading the manual I'm starting to wonder again if there is a processor in the dispenser unit. There is a "Link" indicator on the scale's display. No problem either way; I had always planned for both scenarios. I thought the scale simply unplugged; but the units are connected by rails. I decided to start using it before sniffing out the connection between them. That won't take more than an hour or two with a logic analyzer and multimeter when I get around to it. 

I started playing with the radar units, but don't have any real information yet. I did burn up my first one, and the power supply I was using to test it; totally my fault. But every other one I've tried doesn't work all that well. Furthermore I can't find them on the radio with an SDR. Either the design was changed intentionally to move the frequency, or unintentionally with incorrect components. Even a human body doesn't set them off more than 1 meter away (they should see 5-7 meters). A bullet on a stick does set it off about the same distance as a human finger. Looks like the internal filter will also need to be modified... When I know what's going on I'll present something more concrete. In the mean time I plan to step up to real doppler radar modules and see what they can do. Those also are likely to need filter upgrades for fast moving objects. 

And; I'm going out to chop the rest of my Lake City brass while there is still daylight...

[Lane]

Kind of frustrated by this 300 Blackout conversion process.  As I mentioned earlier; I should have started that a while ago while waiting for other things to show up. Doing it at this point in the build is adds insult to injury; I had more free time back then... I almost ordered .260 dies to cheer myself up. I'm looking forward to a conversion that isn't so labor intensive. @98Z5V ; did you measure wall thicknesses on your .308 brass before deciding to turn necks for .260? I'm simply wondering if a certain brand (wall thickness) will just work with neck forming; not a question about concentricity at this point (though maybe down the road)...

Made a special trip to find more brass this morning; and was rather disappointed. Only two bags on the shelf; they cost more than last time, and no LC stamps in sight. I bought them anyway, and found only three Lake City cases in one of the two bags of 100. I'm also not certain all these are only once fired... Whatever; lesson learned. The majority of the cases were FC which is on the approved list for conversion. Quite a few varieties of FC, including one that looks bronze. I'm planning to stick with the Lake City for testing, but still going to collect the same data on every other case I can find for future reference. 

Processed two of each of unique head stamps as 300 Blackout; and have about 150 cases in the wash. After they are done, I wipe down, dry on a heater, prime... and they are ready to load. That is all the rest of the LC I have on hand, and will give me enough choices to do other kinds of testing as questions come up.

Speaking of questions... @jtallen83 I listened to that podcast while chamfering cases last night. It did make me want to go shopping for more tools at first; but thinking about it more today I want to listen again. It is kind of slow and off the cuff; but a lot of good information presented in the process. I was most struck by the anecdote about the hand primer blowing up; and the damage it did. I ONLY hand prime myself, because priming on the press scares me more... I would like to revisit a few parts of the reloading discussions though; and I have some questions already that weren't addressed in the podcast. Great way to pass the time while processing brass though, thanks for that.

While closing out tabs in my web browser I found a mention of the radar unit not working well on a breadboard. Sure enough; that sounds like the problem I was having. I'll build a more chronograph focused design and add cables to the headers I already soldered. That might be enough to get this cheap solution working. No idea if that will help me find it on the radio though; which is of extreme importance to me. I've never seen something fire up in a partial oscillation mode (kind of works); typically failure to oscillate acts more like a short circuit? Maybe this is one of the fun properties of microwaves?

I do have some more surprises to announce along the way here, but for the time being; I'll just keep my head down, and keep working... I have yet to finish the full scale casting furnace. The real design constraints here are installing it underground, and piping the blower feeds at the right angle to create a swirl of hot gas around the crucible. These are not issues for a 3-10 pound pour; but very much important for a permanent larger scale installation. 

No sense doubling up on posting in my threads (though I think the scale / analytical balance was a cross post from my 7.62x39 thread?)... All of my twice fired 7.62x39 brass is clean. But; I realized I still need to fire off the rest of my factory ammo to make more once fired brass. No sense poisoning the purity of those earlier ladder loading tests. I learned a lot of things about neck tension and bullet seating during that earlier testing. Might as well keep working towards the same goals with that build while I get my ducks in a row with 300 Blackout...

Collected 18.00 grams of brass shavings from chamfering, and "quick trimming" cases. That's none of the dust from cutting (all contaminated), nor any of the 5.56 case necks. I'm not really fond of casting brass; but it seems like I should do something with all that. I have blisters to show for the work after all. That's more than 3 full LC brass cases in weight...

I took a whole bunch of pictures; but don't think many of them are all that interesting. Let us see who can figure out my case chopping method... It's not as simple as it looks; but it sure is fast.

[98Z5V]

1 hour ago, Lane said:

Kind of frustrated by this 300 Blackout conversion process.  As I mentioned earlier; I should have started that a while ago while waiting for other things to show up. Doing it at this point in the build is adds insult to injury; I had more free time back then... I almost ordered .260 dies to cheer myself up. I'm looking forward to a conversion that isn't so labor intensive. @98Z5V ; did you measure wall thicknesses on your .308 brass before deciding to turn necks for .260? I'm simply wondering if a certain brand (wall thickness) will just work with neck forming; not a question about concentricity at this point (though maybe down the road)...

 

Forming your own 300BLK brass from 5.56 brass is a lengthy process - to do it right, and "easiest."  Oh, I know.  Somewhere here is a listed twenty-something step process for converting LC 5.56 brass to 300BLK.

My .260 - Yes, I measured neck thickness before, on various  .308 Win brass.  The Hornady Match brass was the most consistent, and that's all I've ever used to make .260 brass from.  It's excellent brass.  However, move that diameter down, and you've got the same amount of material taking up a smaller diameter, and the neck outer diameter dimension is larger than it should be.  I turn the necks down on them all, both inner and outer diameters, perfectly matching every time.  Some need more turning than others, but the inner and outer neck diameters will always be within the limits that I set the neck turning die to - and that's on Hornady Match brass.  I can only imagine what I'd have to do if I was mixing lots and brands of different 7.62 NATO brass. KM Shooting is the neck turning products that I bought. 

.260 Rem is the only case that I neck DOWN.   I'd turn the necks on any brass that I had to neck down in caliber.  Necking up is not an issue with wall thickness.  I currently only neck up 25/45 Sharps and .338 Federal. Those two never have issues.

[Lane]

Thanks for the tips on the .260 conversion. I think I might have asked that exact question before; but this time it was from a different perspective. I was thinking about how the expander ball works with neck forming in the die. If the ball were sitting next to the narrow portion of the die; wouldn't it neck down AND stretch the neck longer at the correct thickness? Isn't it because the two operations happen separately that neck turning is required? It may take a few different steps to get there, but I'm thinking it could be done by swaging the brass instead of shaving it? Just a thought...

I've been using Tide as my case cleaning solution; but might branch out before I load these. I'm wondering if Oxy Clean, or Palmolive Oxy would do a better job freeing the powder residue. Similar questions about lemon juice... This is because I don't tumble brass here.

Still thinking about the powder dump on the Chargemaster. A few options I see are: drill a hole and pin it closed with a paper clip, or tie it closed with wire. Try to jam something in to gap keep it from moving. Or remove the wheel and add a detent of some sort (something that should have been included in the original design). 

Attached 3" of rainbow cable to the radar modules and got them working. It appears I can trigger the sensors with a bullet on a stick; and can see changes on the spectrum analyzer as they happens. They are remarkably sensitive to my body position around the device; and almost seem to work better with me as a reflector. I remember reading about scientists tracking human positions behind walls with 2.4GHz (WiFi) reflections; this looks remarkably easy to do...  Curious to see how they act when I'm nowhere nearby, and how far they transmit. They don't draw much current at 3.3 volts, so it shouldn't more than a hundred feet or so. Need to find a power pack and wire them up to a length of 2x4, or better yet 2x2 if I can find a table saw. They all operate at slightly different frequencies from each other; so I'm curious to see how they act with others running at the same time (do they drift together, or into a different frequency depending on which others are running?).

While soldering up some more modules for testing I noticed some pads on the back of the module. R-CDS doesn't matter to me (light sensor); but C-TM and R-GN seemed like they might be useful. After consulting the schematic I can see they aren't of immediate importance, but I can add some wire on to the capacitor traces to modify the tuning. Not ready to fire this one up yet; but one can cut, twist, and shape the wires to modify the capacitance. The inductor could also be modified with a cut to that trace and addition of wire. 

Edit: Ended up going the safety wire route on the Chargemaster drain. I thought I could pin through the right spot with a single hole; but it didn't work out. I had to drill a second hole to tie them together. I'll make up a piece of paperclip in a U shape to hold it more securely (and make it easy to replace after draining). Took all of two minutes with a pin vise. Without such, it wouldn't take more than a cat, or a stray finger to have dumped a whole pound.

Radar array works how I expected; looking at 1-2 MHz separation between modules, and it holds nice and steady. Reasonably certain the bullet is triggering the sensors now too. 

[Lane]

Brass came out great! The lemon juice at the end really kicked it up a notch. The split is almost 50/50 between LC 14 and LC 16; may even use that distinction to keep the brass gun specific in this case. Have 14 different case types converted to measure volume and wall thickness on; including LC 12, LC 13, LC 14, and LC 16. I presume all those LCs will be the same volume; but worth collecting the data since I can. I've read anecdotes that FC brass can vary dramatically in thickness on different head stamps. 

Running the microwave sensors close together and powering them on at the same times shows some inconsistent results. Looks like they might be tuning in to each other sometimes. I tried splitting them on different rails. I ran the numbers through a Colpitts calculator and came up with an addition of 2.5pf on one of the capacitors to drop into the 2.4 GHz range. Not sure how short a twisted wire that is; but sounds pretty short to me. I'll run that test later; trimming some wire wrap wire on a meter before I modify that specific sensor. 

Ran the numbers on bullet speeds to see how far apart I need to place my sensors. Even a 5.56 round traveling at 4,000 FPS will take a quarter of a millisecond to travel 1 foot. I don't see a reason to stretch out to 10 feet right away with a chrono build. I think I can get away with four sensors mounted on (or in) a yard stick actually. That allows me to play with separating units physically, and gathering more data (if only two sensors trigger, or three out of the four). My only question is how the wire connecting all the units will affect their operation; may need to be wider than a single yard stick if I have problems. 

Update:

Checked each case with a headspace gauge, and measured case volumes of water. I was surprised to find that the LC 14 and LC 16 I have measured different from each other. It's possible I just tested two that were different some other way... Maybe the spent primers I used were different; but it's a game changer if it is true. Even after testing with powder I got roughly 0.1 grain difference between the two. More experimentation to come in this case

Still need to chamber a few to make sure everything is smooth, they come out of the chamber clean, make dummies for each projectile, etc. I've already started priming a few of the cases so I can start assembling ladder loads soon.

[Lane]

That last post was from yesterday mid-day; I simply didn't feel like I was ready to "Submit Reply" because of all the questions I still had (and have)...

Here is a peek at the @SimonSays radio chronograph. I had to bump the first and forth trigger inward just a bit so they didn't overhang. That won't be a problem in a more final build; but the yard stick prototype is field expedient; and I can calculate the difference very easily. Just need to go cut a piece of CAT 5 cable and strip it in very specific ways to connect each trigger. Might as well use an RJ-45 for the interface...

Whole bunch of unveilings coming up; but I'm trying to tidy up all my loose ends in the mean time. Pretty excited to see numbers come out of this chrono build. I may still need to replace (or add) some resistors to each board; but that's quick once I figure out what. The more difficult problem is the blinders; but I read somewhere that some types of glass (metal content?) make great RF blockers in the microwave range. I just happen to have a box of colored glass, so I'll get to work testing that. I'm thinking a triangle shaped window would be best in that case (easier to cut straight lines in glass). Don't think I care much about horn antennas now; but if the resistors don't fix everything I'll care. The analog output does appear to work for bullet too, but I had issues triggering my oscilloscope when I was testing that part. Might need to read a manual again (or perhaps even calibrate the unit); it's been a while...

[Lane]

A few humorous tidbits about my progress. Adding a McDonald's straw to the trickler tube on the Chargemaster is standard procedure for a lot of users. Given the variety of powders I have on hand; I figured I should go pick one up. I thought about walking in, grabbing straws, and bolting for the door; but I ate some "food" to act relatively normal. Only; the straws here are some kind of plant based plastic, and not the old larger diameter straw they used to be known for. I looked all over on my way home as someone used to throw McDonald's out their vehicle window all the time (perhaps didn't want the wife to know?)... But I couldn't find a single vintage McDonald's straw blowing in the wind anywhere I looked. I thought the reason we had to outlaw these things is that they were polluting the environment... 

I quite literally drove out of state to find a regular old school 0.300" diameter McDonald's straw to use with the Chargemaster (BK has a 0.275" O.D. which is loose in the tricker, the new Eco-McDonald's is around 0.250"). Get them while you can out there in the free states.

Weighed a bunch more Lake City cases to get a better idea what was going on. Certainly; since they are homemade 300 Blackout conversions there will be a bit of variation. But what I'm seeing a general tendency towards a stronger deviation; and a measurable difference in case capacity. I had not considered weighing out every case before. May still be splitting hairs; but I don't want to collect useless data either. The one set of cases I did weigh varied by almost two grains; with a distribution predominately at the high and low end of those measurements.

Thinking cases would have a higher standardization on a specific weight was pure conjecture on my part. I suppose I didn't know enough about how they were manufactured to begin with... I found this link which was interesting: https://www.petersoncartridge.com/our-difference/drawing-brass/ I presume sorting brass by weight is part of what makes match brass more accurate? Decided to order 1,000 Lake City cases since they aren't regularly on the shelf around here; 500 new; 500 once fired.

Can't find a breakout board for the accelerometer chips anywhere. I thought I could adapt something I had ; but that doesn't look promising either. I suspect I'll be wiring it up by hand and doing a quick reflow.

Wired up four of the radio sensor modules on the yard stick and started playing around with the array. Turns out one of them was behaving badly, and had to be removed. The other three fire up and settle in to the same general frequencies each time. Next up is testing them with various blinding materials to keep them focused on what matters. Should be trivial to adjust the circuits after that to provide the deviation necessary to trigger timers. I thought I ordered almost dozen of these modules but can't seem to find any more of them at the moment. One would need to pick and choose to find some that operate well with each other. This set stabilized around 3.089 GHz, 3.100, GHz, & 3.111 GHz; though I wouldn't mind having some that were even tighter together if they didn't interact with each other. I did have a ping-pong situation with a different setup; where two would keep triggering each other back and forth without human interaction; ended up changing the spacing slightly to resolve that issue.

Loaded my first few 7.62x39 with the Chargemaster just for fun. It was pretty easy to dump loads (though the software could use an explicit ladder load function). Tuning them on the analytical balance was also pretty painless with a tiny spoon. Going to have to perform the same procedure again (and many times in the future); so it was a good practice run. I should have recorded the before and after weights; but I can say the Chargemaster throws right around the stated +/- 0.1 grain.

[shooterrex]

DQ  has fat straws for the shakes.

[Lane]

Burned... Looks like I put a fork in the microwave. I can't find decent carriers anymore no matter how I seek. I was experimenting; and it appears they will burn out some part of the circuit with too much metal nearby while operating for any amount of time (probably that central transistor). For less than a dollar each, I'm not out any money. I already knew I needed a huge selection of these to get frequencies to work in my favor.

I am simply going to move on to the other types of radio and doppler sensors on hand at this point. Anything is better than what I was working with; but it sure was fun to try these in the mean time. Have a virgin optical chrono here still. I want to sell it and buy a radar unit; but I might use it short term. If I can adapt any available radar sensor to work; I might not care much either way.

Sorted my cases again by weight, and will do a few more tests before dumping my initial loads. Very much want to wipe down the green plastic of the Chargemaster with a dryer sheet. Dumping the powder and cleaning the unit actually took longer than using it to throw charges. I'm still not confident it's empty; but don't want to vacuum it out either. These are minor complaints about the total experience. This thing works in ways I don't want to (and is totally fine without a straw so far, using tiny ball powder). The dispenser unit is available for a bit less as a separate product. I can certainly see why people own more than one of these things. Maybe the earlier mentioned interface/adapter device; should support more than one; (or chaining), to avoid the extreme clean out procedure... Three dispensers and one good scale should cover most people given the anecdotes I've read about it so far. I'll take any and all feature requests to make powder charging easier...

[Lane]

On 5/23/2019 at 5:15 PM, shooterrex said:

DQ  has fat straws for the shakes.

Thanks for this tip. Turns out that the DQ straw I got with my shake was exactly the same as a "standard" McDonald's straw in diameter. That means it's a perfect substitute for use with the Chargemaster 1500. This will save me from EVER having to set foot in a McDonald's again; so, very much appreciated!

Picked up some more trays while I was out so I can sort cases by weight once they are converted to 300 Blackout. I may actually weigh a few first and see if there is a strong correlation after the conversion. As in; can I pre-weigh to choose which brass I wish to convert, or I will I need to convert first to determine which weight/volume class they fall into? Minor issues; I still haven't worked the out chamfer and case length trim solutions yet. Those were the parts that proved most difficult by hand in any volume of brass conversion. Opened up three bags of new Lake City brass, and was a little surprised there was one single extra case in each bag. I'll probably chop a hundred or more of those tomorrow...

Also got a bullet resizing die for .308. I think it was Vaughn that recommend every bullet be resized to true the base (or was that King). I remember a discussion about a tuft screen; so I'll have to go back and read some more... My only questions here are; how to Measure bullet base flatness, and how much change will result on abnormal projectiles like the Hornady GMX.

Thought a lot more about the 3 GHz modules over time; and everything else around here... Multi-path reflections were always a fun thing to look at; planning to block that anyway. But, what really hit me (again) was that the blue paint on the yard stick might be my only real issue left. Given the "specific" dark blue color; I am willing to bet money it's got a significant amount of copper in it. Not sure which way to test that; flame is probably close enough, but chemically is easy too. Four hundred grit sandpaper would make quick work of that either way; cheap, fast, and good. Who says you "can't" have all three?

[98Z5V]

1 hour ago, Lane said:

Thanks for this tip. Turns out that the DQ straw I got with my shake was exactly the same as a "standard" McDonald's straw in diameter. That means it's a perfect substitute for use with the Chargemaster 1500. This will save me from EVER having to set foot in a McDonald's again; so, very much appreciated!

 

You woulda been good, if you lived in a Free State.  Seems that only NY, CA, and WA have those fake paper straws now.  I still get fat plastic straws from McD's here in AZ.  We're not trying to free the planet from the "straw epidemic" that some kid started, as a hypothetical school science project.  Pure conjecture and bullshiit, but repeated en masse by the MSM - as some sort of a crisis...

Okay, off my political soapbox now, on that topic...   sorry to derail your thread... 

Get to a Free State... 

 

[Lane]

7 minutes ago, 98Z5V said:

only NY, CA, and WA have those fake paper straws

You looked. And you dug deep! I have a shovel and rake in my hands the days...

It's not quite "paper"; but, the diameter is the only thing I cared about in the first place.

Had to bag up the analytical balance to facilitate other work. Don't need it anytime soon anyway; the 0.1 grain accuracy is totally fine for weighing out brass.

[98Z5V]

9 hours ago, Lane said:

You looked. And you dug deep!

Nah, that was off the top of my head - I've been keeping track of this idiocy.  OR will fall victim next.  The Left Coast is a Liberal Stronghold, and OR feels left out of this straw-deal, with Cali and WA pinching them in.  Watch it happen...   Portland Hippies... 

[Lane]

Chopped seven pieces of new Lake City brass last night just to see what was up. Then did another 150+ this morning. Doing it bare handed I only lost three because of poor grip, and perhaps two more cut short. I still have a few (hundred) left of these; and some once fired still coming in the mail from Hawaii of all places. While I wanted to buy these things locally; the availability, and quantity of quality just isn't here (close by at least). 

While such minutia in terms of this project; this straw thing still has me thinking. I remember actual paper straws being available some thirty years ago. They were probably cheaper; but weren't at all popular (perhaps due to the mouth feel?). This eco-straw looks and feels like plastic; but isn't being custom made in McDonald's size... I'm nearly positive it's not cheaper; and it's an off the shelf product (not branded).

Years before the plastic bag ban was even discussed here in NY, the recycling company requested no plastic bags, no straws, no clear plastic containers, blister packs, etc. They only wanted cleaned well labeled recyclable materials dumped loose in the container. Their complaint was; recycling materials were too dirty (because it's single stream), and the resulting materials weren't valuable to China anymore. The slogan at the bottom of the letter I got from the municipal recycling contractor said: "If in doubt, throw it out". 

Sure; there are dirty places where garbage blows in the wind, those are predominately urban areas in this state. I remember driving into New Jersey (one of the very few times); and seeing a billboard that said "New Jersey doesn't smell". Less then a mile further down the road and I was hit by a terrible odor! And it continued to smell bad throughout most of the rest of that journey... The shoulders and empty lots were full of garbage blowing in the wind. Are these laws going to stop people from throwing whatever new garbage we invent out the window? Isn't this a Futurama episode? People are dirty; but at least we don't have the homelessness problems I saw in WA, OR, or CA. That kind of garbage is just shocking to see in person... I love the west coast (SERIOUSLY I do). I want to visit again soon; the rest was beautiful.

Landfills are probably as valuable, or even more-so than what we ship overseas as "recycling" material these days. I'm all for recycling; melting down, and casting aluminum scrap is a hell of a lot easier (and energy efficient), than extracting it from bauxite. But I'm not allowed to recycle my straws (nor do I throw them out the window while driving)... So; what's the point? New laws for some business purpose; or, just because we want to sound smart and get reelected? I'm not impressed any way you look at it. Who is the lazy A-Hole that got us to this point? Why can't we have nice things?

Does anyone in congress have a doctorate; what about state government? I actually had to look this up; and the numbers are staggering... https://en.wikipedia.org/wiki/List_of_United_States_politicians_with_doctorates

It's nearly impossible to vote for really intelligent people; especially when you throw party politics into the mix. Actually recycling materials could be a real business opportunity; we used to be able to get good money for recycled goods (probably before we started using single stream). It wasn't really that long ago; and I don't see any other market factors pressing those issues. Give me some more polymer tips... I really like those. 

We're really not talking about straws, and try not to use a "straw man" argument. 

Thanks; thank you again, and thank you all. I appreciate all you do around here.

[shooterrex]

On 5/26/2019 at 6:24 PM, 98Z5V said:

You woulda been good, if you lived in a Free State.  Seems that only NY, CA, and WA have those fake paper straws now.  I still get fat plastic straws from McD's here in AZ.  We're not trying to free the planet from the "straw epidemic" that some kid started, as a hypothetical school science project.  Pure conjecture and bullshiit, but repeated en masse by the MSM - as some sort of a crisis...

Okay, off my political soapbox now, on that topic...   sorry to derail your thread... 

Get to a Free State... 

 

DC has the paper straws too. All we got in the restraunts around DC last weekend.

[98Z5V]

Just now, shooterrex said:

DC has the paper straws too. All we got in the restraunts around DC last weekend.

That figures.  Seriously.