Jump to content
308AR.com Community
  • Visit Aero Precision
  • Visit Brownells
  • Visit EuroOptic
  • Visit Site
  • Visit Beachin Tactical
  • Visit Rainier Arms
  • Visit Ballistic Advantage
  • Visit Palmetto State Armory
  • Visit Cabelas
  • Visit Sportsmans Guide


  • Posts

  • Joined

  • Last visited

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

BeeKay's Achievements

  1. Thanks - I'm familiar with a some of the basics of metallurgy and manufacturing so this all makes sense to me. At least - Now I have a bolt / barrel combo that headspaces correctly so I'll go with that .
  2. I have three BCGs and two of the bolts are marked with MPI and the other is marked with MP. I'm not sure whether that indicates the manufacturer or some other spec. I do get correct headspacing when I use the MPI bolt with a particular .308 barrel, When testong it with GO / NO-GO Gauges. But the bolt that works with that Barrel isn't the one that originally came in that Bolt Carrier. It seems to be a proper fit, though. I have a couple side charging BCGs and the other is a rear charging so swapping the entire BCG is out All feedback appreciated
  3. Just curious about what the inside story is on bolt production. It seems like it's a part with very exact tolerances and metalluryy specs so they must come from a central source .... Just guessing. I'd be interested in finding more info on that.
  4. So - At this stage of the game, I can say that this particular Barrel / BCG / Bolt combination, Positively has excessive headspace.. It's a .308 / 7.62x51 Barrel / BCG from the same manufacturer bought at the same time, but not as a package, as they don't offer a Barrel BCG package. Fired less than 50 times I performed the following tests and this Barrel / BCG Combo failed them all #1 ) Go / No-Go Gauge test : the bolt closes on the No-Go Gauge #2 ) Tape on the No-Go gauge - Adding .002" thickness - Bolt still closes #3 ) Light Primer Strikes #4 ) Firing a new case with primer only, reveals primer protrusion of .010" I tested my Go/No-Go Gauges in the chamber of another gun (Browning) and the test indicated results for a proper headspaced chamber. In that same chamber a neck sized case from my AR won't allow bolt closure. I have four AR-.308 Barrels - And I found one that has better headspace test results. But I haven't had a chance to take it out and fire it yet. So I'm looking forward to seeing how that goes. One of the things that I'm looking for is to be able to share neck-sized Reloaded Ammo with my .308 Browning lLever Action . That may be expecting too much,though. I won't name the manufacturer unless someone asks, I've mentioned that in previous posts and I'm hoping that the company will correct the problem, so I don't want to sour my relationship with them.... I'm thankful that I followed some of the headspacing threads and decided to follow this step, because there are issues that came to the surface which would have been a source of future problems.... Another point of interest is that, The least expensive Barrel / BCG Combos that I have, passed the headspace test - BCA. We'll see how they shoot. I would have just broke down, and bought a new Barrel / BCG from Wilson, but I have four already. Learning new things - Thanks for the helpful info
  5. I learned some tinngs about the sequence of events when a bullet is fired in a chamber with excess headspace, by building a TC Contender in .30-30 Ackley Improved. The A.I. chamber has parellel walls so the case clutches the chamber under pressure. Ackley himself fired a round in a rifle ( in the lab ) with the lugs removed from the bolt, to demonstrate that. Excess headspace with that cartridge means stretching at the web . But if loads are fired, that don't have enough pressure to stretch the case, then the primer protrudes until the bolt face stops it. Or the breech face. But clutching the chamber walls doesn't happen with a tapered chamber, so there are different signs of excess headspace.. That may be relevant ?
  6. I'm busy too - Otherwise I would have been done with this years ago I'll be patient - Thanks
  7. Do tou suggest that I send JBMatt a P.M. ? I did fireform some cases and it would be interesting to hear what someone who knows their stuff has to say. Because now I have more questions. Reloading brass is interesting and especially with rifles there can be a lot of details that make successful vs mediocre reloads.
  8. Excellent - Thank You I need to fireform some cases, because my .308 brass got mixed together between 3 different rifles, so it's hard to know for sure what I'm measuring . But out of about 100 fired cases, I didn't see any that had proud primers. I'm looking forward to following through on this. With luck I'll get things dialed in to the point where I can share reloaded ammo between 2 or 3 different rifles with acceptable accuracy and reliability
  9. I have a home-made comparator now - It works well - I get repeatable results within .0005" , so it doesn't jiggle or go off center and create errors. When I use the comparator to measure my No-Go vs a new unfired case, the No-Go is only .001" longer - So that tells me something. I'll dig thruogh my fired brass and see what I can find. I have three .308s so it will be interesting to sort it. Thanks for helping to keep this project moving in the right direction.
  10. Wolff AR-10 springs are on backorder so I ordered some from Tubb I'll post on how they work when they arrive It's surprizing to me that AR-15 mag springs are so abundant and AR-10 mag springs are next to non-existent.
  11. There was a guy who posted here a few years ago, and he showed a pic of his bolt and the lugs were chewed up and his question was : Is this normal wear for a few hundred shots ? Everyone said : That's DAMAGE not WEAR - That's the situation I'm trying to avoid So - It sounds like excessive headspace by + 003" or so - Won't destroy my bolt - But will cause case stretching or fireformed cases that can't be reloaded and shared with other rifles with a SAAMI spec chamber . Do I have that right ? I didn't mention that I'll be reloading the brass Thanks for taking the time to clarify this stuff
  12. Yes - The KAK / KAK Bolt combination does close on the No-Go Gauge . I tried creating a thread a few weeks ago, And It's a fine line between NOT PROVIDING ENOUGH information and PROVIDING TOO MUCH info, and then creating confusion . I've made guns that are chambered in Ackley Improved and Herrett wildcats, so I understand some basic things about headspacing issues. But those builds were single shot, folding action guns using the .30-30 as the parent cartrige... So it's time to expand my education At this point : I need to get a comparator and check the length of a fireformed case. The thing that I'm uncertain about at this stage is : How Much Excessive Headspace Is Tolerable ? I guess I'll find out after I fire it and measure a fireformed case Additionally - I have a couple other barrels and bolts and I've tried checking the headspacing on those, using the Clymer gauges, and the bolt would close on the GO GAUGE - and NOT close on the NO-GO GAUGE .
  13. I inquired about this earlier but due to weather / acts of nature conditions and other situations, the thread began to get confusing. I bought some .308 Winchester headspace gauges recently and they're Clymer Go/No-Go gauges 1.630"/1.633" I have three uppers, including dedicated BCGs of various chamberings, which I may end up referring to, but I'd like to focus on my .308/7.62 KAK Barrel/BGC combination. Prior to this, I haven't measured headspacing because the word online seems to be - If the bolt and barrel are from the same source, they're probably Ok. But there are others online who say - Measure It Anyhow. So what I have is a KAK Barrel and BCG that I've measured using my new gauges and that particular chamber has loose headspacing. I emailed KAK and his only questions were "Did you buy it from us ?" and "Have you tried firing it ?" Then he just told me it's probably okay - Keep using it. I'll add - I tried chambering the Clymer Go/No-Go Gauges in a couple of other chambers and the bolt would close on the Go Gauge - But won't close on the No-Go But this KAK Barrel/BCG is apparently loose - What should I do ? I'm somewhat familiar with headspacing, but not on rifles with bolts using locking lugs... So I'm aware of the case stretch issues etc ... I'm seeing that a check for a protruding primer is a good check and using a comparator to compare a fired case to the gauge ? I'm not sure what the next step should be - I wish the tech guy at KAK would have been more helpful.
  14. Hey, Sorry - I ended up making those posts here because I thought this was a thread that I started We had some power failures here over the past 3 weeks and it caused confusion. But there's good info here anyhow Not trying to hijack this thread
  15. ALSO: All of the barrels I have have been fired numerous times . I've fired the .308 barrel the most . I had all 3 barrels but only one upper and BCG so I swapped the barrels just to try them out and see how it runs... No real issues, but I decided to have a dedicated upper/BCG for each barrel, so I bought some new uppers and now what I have is the set-ups shown above . The .308 barrel/BCG combo has been fired about 100 times and the two .358 barrels have been fired about 50 times each, using the same BCG as the .308. I'm not seeing any wear patterns that show possible damage. I haven't measured fireformed brass for stretch yet.
  • Create New...