Posted 10 March 2011 - 05:38 PM
I have about four or five .30 bullet types laying around , so I chose a Hornady 150 gr. sp & a Speer 130 gr. bullets.
I cut the top off the 5.56 brass with my Dremel tool with a reinforced cut off wheel & deburred cases before I formed them.
They are a little long & will use my trimmer to trim them down to about 1.360" , to start out with . I will chamber them to see how they work . I will adj. as needed.
The bullet on the left is the 150 Hornady & the right one is a 130 gr.,Speer Varmint bullet
( I shot a seven point buck in West Virginia with a M1 Garrand with this bullet & can tell ya ,it was devastating .)
Posted 16 March 2011 - 05:59 PM
I loaded some up with 2400 & can only get 16.5 grs. in the case with out compressing the charge . The H110 I got 20 grs. in there with room to spare .
I will testing the upper & ammo Friday & will post results & photo's.
Posted 16 March 2011 - 06:05 PM
Posted 17 March 2011 - 02:53 PM
Hay I'm a virgin again !
Posted 18 March 2011 - 05:29 PM
125 gr. Speer , 16gr. ,2400 ,avg. 1954 fps.
150gr.sp. ,Hornady , 15 gr. 2400 , avg. 1723 fps.
125 gr. Speer , 19 gr. H110 ,avg. 2132 fps.
150 gr.sp. Hornady, 17 gr. H110, avg. 1846 fps.
125 gr. ,Speer, 20 gr. , H110 avg. 2211 fps.
As far as grouping , I didn't do any ,because I am working up loads . I can tell you this ,the 20gr. of H110 looks good .
I did have a couple of primers that blew out part way with the 20 gr.load of H110. I used 7 1/2 Remington bench rest primers & I didn't like they way they seated or fit .
No primers showed any high pressure signs ( blow out primers can be caused by many things ). Kinda makes me wonder about the brass I was using.
I had several that fell out of the case when priming . This was once fired LC 5.56 brass, even though it was only a few ,its enough to change primer manufacturers, I will use CCI & WW next.
Other than the couple of primers (3) this is a awesome rifle to fire . I had a couple of people at the range ,that had never heard of the 300 BLK.
Can't wait to do some grouping.
Posted 18 March 2011 - 08:49 PM
Posted 20 March 2011 - 09:24 PM
As said , There was no signs of high pressure on the brass that didn't pop the primer & ya know ,I've been thinking about that brass . Its range brass in some way I'm sure, might have been some ones last loading & they just happen to use Remington 7 1/2 primers (because they are the same color as factory primers )
I will make all future cases from known good once fired brass, but use this fodder until I see problems .
I'm not done with testing loads for this rifle & she can be seen on the Rifles section ,under the 300blackout thread. 2300 fps can be reached with out a problem ,I think.
What fps. were you looking for again ?
Posted 29 March 2011 - 02:27 AM
Posted 29 March 2011 - 02:26 PM
This last loads we made up with Hornady brass ,.223 & I raised the charges to see how far I could go with this powder(s) cartridge & I found them .
I'm glad I only make five test rounds of each loading ,so as not to have to pull & recharge so many bullets .
20 grs of H110 or WW 296 with a 125 gr. bullet is what I concider max load in this rifle of mine .
18 grs. of H110 or WW296 for the 150 gr. bullets, would be a max loading .
My most accurate load so far ( really to early in testing to be sure ) was a 125 TNT , 20gr. WW 296 & a CCI primer , 2201 fps.
Now that I know what the max loadings are ,I can play with loads & primers to see what comes out on top & go with it .
I never intended this cartridge to be a tack driver , but more of a hunting rifle , but we will see once I get better optics on her .( and finish the POF lower that belongs on her )
Declaimer , these are my loads in my rifle & you should use caution & work up your loads in your configuration.
Posted 30 March 2011 - 03:23 AM
Posted 30 March 2011 - 01:09 PM
I've got enough blow out primers that's telling me I've went far enough & know the limitations of my set up.
I will probably not go that high weight of bullet unless I get a "can" for this rig. Which is why I'm looking at suppressor attachment muzzle devices .
Posted 01 April 2011 - 04:11 PM
This is not what you want to find in your lower.
Posted 28 April 2011 - 03:03 PM
case -ACC Remington 300BLK/primed
bullet -135gr. Sierra MK HPBT
powder - 17.2 gr. of H110
OAL - 2.096"
Here next to my 125 TNT & 150 Hor. SP test rds.
Posted 29 April 2011 - 02:41 AM
Posted 29 April 2011 - 04:15 PM
This is the first rounds fired through this complete rifle with the POF lower & carbine buffer assembly, all new,never fired lower assembly.
The trigger sucks ,the rings are too low now & I guess I can't expect much precision work from a old Turkey scope .
125 gr. Speer TNT bullets , cut down & formed LC brass, 19 grs. of H110 ,
AVG. Vol. -2179 fps ,
good load, not bad groups.
150gr. SP , Hornady bullets, cut down formed ,LC & Hornady brass, 16.6 grs. of H110.
AVG.VOL. -1900 fps,
not bad , had one blown primer ,but this brass has been abused in testing , all the rest of the brass looks good .
135 gr.,Sierra Match Kings, Remington , ACC 300 BLK brass, 17.2 grs. H110.
AVG.VOL. -1993 fps.
This bulllet is impressive , I will post a photo of the target of a 10 shot group .
This bullet shot about 4" high , I had to adj. the scope to get them into the dot of the target, after that I had no problem with keeping them there ,even with this scope & trigger.
After I shot the 10 shot group ,with the barrel hot after the shot string , I put four more rounds range to check Vol. & went from an avg. of 1977 to 2022 fps for an average with hot bbl. , I was not expecting that , the ammo was all hand weighed & seated the same .
It was a 24 rd. test batch of the 135 gr. MK.bullet . Just some thing to think about .
Posted 01 May 2011 - 11:03 PM
Posted 02 May 2011 - 01:20 PM
Muzzle blast can some times give false readings.
I have been lucky with my chrono , I had my first shot the other day show 950fps & I knew it was wrong . I changed the battery in the Chrono & all went well after that .
I would hand load your test rounds , not saying your powder measure is wrong ,but if it doesn't like the powder ,it could have metering problems . Some powders do that to them .
By hand weighing your charges , you can have better consistency & you can fine tune the charge better.Than once you have your load down pat , use the powder measure to copy it .
You can just add a few tenths of a grain at a time & see what happens .
I load three rounds each of progressively larger loadings & then if I get pressure signs I stop & pull the bullets of those over the charge weight of the one that started to show the high pressure signs & just recharge /reload those.
Posted 02 May 2011 - 10:11 PM
Posted 03 May 2011 - 01:35 PM
The COL of the round will be determaned by bullet configuration . You want it close to the rifling but not on top of it .
The lighter/shorter bullets , you don't have any thing stopping you with the COL , but getting into the heavies & there length will make it a problem .
Not only in the chamber ,but in the mag. .The longer heavy bullets will get interference with the rib in a std. mag. if set up with too long of COL.
You can make some dummy rds up with different COL & measure after test feeding into the chamber & if they don't have any marks from the lands , fail to feed or the bullet is pushed back farther into the case , you should be able to load a few test rounds to see how they work .
The 300BLK has a longer free bore to the rifling & that gives you a little lee way.
Are you using 5.56 cases or .223 ? The .223 will give you a hair more volume for powder.
You have to also remember that the bullet has to be supported in the case properly also . If its not , on a auto feed type system can dislodge a bullet .
Posted 03 May 2011 - 10:53 PM