210 Ablr quickly ad help please??!

[31perersen]

hello everyone. I'm in Montana and struggling with my load development. I had developed a load up to 58 grains of H4831 in my ar10 in 30-06 with a coal of 3.37 at 2600 at 50° and war primers. I was getting terrible accuracy due to not having a consistent coal due to trying crunch too much powder....I think. I decided to drop down and worked up to 55 grains changing ingredients only the primer to a federal 215m and was able to shoot about 75 fps faster than the wlr primers with the same load, less powder, barely a crunch, extremely good accuracy....great right? well after monitoring pressure signs I felt good after 20 rounds, went back out and shot another time and monitored the brass for pressure signs the first couple and felt good to go. after loading up my brass after shooting I noticed one that looked like I blew through the primer, which worried the crap out of me. I talked to a few guys who talked me into it being an anomaly since it was 1 of 30. was back out in the same conditions later in the week and watched for a while, good to go. then I noticed a few at the end did it again???? my muzzle velocity on the chrono showed an average of 2550, but load come ups to 900 were 2510 fps. 1 in 10 twist, 22" barrel on a BN36 (ar10 style rifle), with winchester brass (new), 210 grain Accubond LR, 55 grain H4831sc, 3.37 coal, 3540' elevation, 51°, 25.9 inHg.
measurement to the Lans was 3.386-3.402 over 10 measurements, so I thought coal of 3.37 would be good. any chance anyone could pump it into quick load for me and tell me my pressure, please? I will get pictures of the primer, all others were uniform according to any factory ammo with exception of the one and then later 4 more of the 30 fired the next trip.
thank you very much for your time guys!

 

[31perersen]

https://m.facebook.com/home.php?stype=phss&sk=live&gfid=AQC_5j9lgUK1GopV&_rdr

sorry guys, hope this leads you to pics

 

[HARPERC]

https://m.facebook.com/home.php?stype=phss&sk=live&gfid=AQC_5j9lgUK1GopV&_rdr

sorry guys, hope this leads you to pics

It doesn't.

 

[Trnelson]

I can't help you with QL data, however I would suggest turning your gas system down as it sounds to me like you are over-gasing. Primers can be pierced for a few reasons, and even combinations of reasons. Being, the load is over safe pressure, the gas system is over gassed, gas impulse is too early, recoil spring is damaged, gas key is damaged, buffer is too light, firing pin is out of spec... .
Next, don't use Bolt gun data, it doesn't work out so well in a gas operated weapon. I changed nearly every part in the gas system on my LR-308 before I figured out that the diameter of the gas hole in the barrel was to the 'larger side' of specification. I was blowing primers totally out of virgin cases firing minimum loads for GAS OPERATED weapons and factory ammo. It wasn't a safe situation at all , it went to visit the manufacturer twice and came back both times, "within build tolerances ," and still piercing primers the manufacturer was zero help.
Before you change anything as it sounds like the rifle is pretty new, try a box of factory ammo over your chrono and check for problems sooner than when you are cleaning up your brass. I would follow that up by also giving BN tech support a call to find out what load data or adjustments they recommend before you do anything further.
It is not socially acceptable to wear any part of your rifle on your face. Ever.

 

[31perersen]

thanks for the suggestions. it happened with factory ammo last year once too. I did some searching and it looked like some other guys with bolt guns had similar problems. sounded like it was the firing pin or firing pin spring being too weak. sounds like you may be onto something with the gas adjustment or new firing pin. I will talk to BN. I check every round for the first 10 or so firings, then when all are good, move on and check my brass when I'm home or picking it up. I didn't realize factory rounds could be unsafe in an ar-type weapon, I thought if anything, it would be under the pressure that a bolt gun would be getting with the same round simply due to the gas being used to cycle vs all the gas pressure building up as would happen in a bolt gun.....or so I thought. thanks, I'll let u know what they say at BN

 

[thatguyshm]

If the gas block can be turned off, it may not be a bad idea to try it as a single shot, that way you can find out if it is a gas issue.
Are you crimping? I would think with such a large bolt and a compressed load, you run the risk of the bullet sliding forward as the bolt slams home, especially with a large front heavy round such as what you are loading.

Factory ammo may not solve many problems unless you go after 147 gr ball ammo designed for the Garand since that is what they are claiming it is similar to.

When you are trying something new like this, it's all outside the box of conventional reloading for the 30-06. Going to take a lot of trial and error. Try to change one thing at a time.

I would load a dummy round complete with powder and chamber it the normal way you would normally, just with a dead primer. Measure before and after, that will tell you if it is growing in COAL.

SHM

 

[eklarsen]

Quick load results of 46,667 psi with 2,378 fps given the load you mentioned. If I adjust for the land jam it bumps to 47,718.

 

[WildRose]

You can solve the OAL issue by seating your bullet in 2 or three stages and by then using the lee factory crimp die. Compressed powders will sometimes eventually push the bullet back out a little bit without crimping.

You can also have a problem with them rattling loose in the magazine of semi auto rifles in particular.

This is the biggest reason military ammo is crimped.

You might also want to look at some of the Alliant Powders like RL23 which really shines in the 06 size cases.