I'm having problems with my blackrain 308..it was sent back for over gassing they said buffer was broken and replaced spring and buffer. Took it out again.. I'm getting pierced primer. I'm using 168 adi match. I emailed black rain and they said it was ammo. Don't know if anyone has had this issue. Advice is needed thanks

Mods. Don't know if this was the right place to post this, please move if not

Pierced primers are typically an ammo problem and indication of extremely hot loads.  Do you have any other pressure signs in the brass?

It's a little pushed up around the primerstrikes that haven't been pierced. But no swelling around the case. There is a slight dent on side of Case on every round shot about a 1/4 the way up from the neck too, don't know what that means.

That dents probably when it ejects its hitting the deflector. If the deflector wasnt there the casing could hit you in the noggin. Thats normal if its a small dent.

Pierced primers are typically an ammo problem and indication of extremely hot loads.  Do you have any other pressure signs in the brass?

I'm with MWPX on this one.

 

What is the source of the ammo?

Would agree but haven't heard an thing bad about this ammo actually heard great thing but am going to try some different stuff, black rain said they used American 150. It's from sgammo Australian outback 168 sierra hpbt matchking

Thanks for the replys, going to take it to howell gun works if it happens with the otherammo

If its 1/10 twist. Ive found the best factory ammo is am eagle m1a ammo for accuracy past 100 yards. 149 gr is only good maybe to 100 yards. Thats in my dpms ar10.they can be finicky. Cool idea but im not convinced its a great platform.

I'm starting to feel the same way.. seems like it's a very finicky platform for 308 I'm sure once you get it dialed in it'll be a blast.. but right now not so much fun

Try some NATO spec 7.62.

Will do griz thanks

If its a hot load what actually happens that causes the primer to be pierced or to get pushed up around the primer strike

Anyone think its firing pin protrusion?

Anyone think its firing pin protrusion?

I do not.  If it was, it would be grossly out of spec and you'd be piercing every primer.  

I'll try some other ammo..golf battery it's 1/11 twist

One more thought I was reading about. A weak hammer spring not keeping consistent pressure on the pin when engaged ? Any thoughts on that?

One more thought I was reading about. A weak hammer spring not keeping consistent pressure on the pin when engaged ? Any thoughts on that?

 I think you're overthinking this.  Occam's Razor would suggest to look at the ammo first.  

Midwest px, haha I am a strong believer in that theory...love it, thanks for bringing me to my senses

I have a DPMS in 308 and I can say it is hard on primers.  The same load shot out of my M1A has a completely different look to the spent primer.  I have never had a punched primer that I could not trace directly back to winchester large rifle primers. 

What Im saying is I agree with the bad ammo theory.  Try something else and see what happens.  I also would recommend that you try something NATO (7.62X51) and see if it gets better.  The AR10 platform seems to appreciate a tougher primer than your typical .308

Ken

picture of pierced primer and cratering

That looks like it's pushing the primer back as well on some. I'm saying either hot ammo or a tight chamber bumping up pressure.

The ammo is 2755f/s is that hot ammo?

The ammo is 2755f/s is that hot ammo?

Out of what length barrel?  Is that what you clocked it at or is that what they listed?

That's what they list it at and 18 in barrel..

You need to chronograph them from your rifle.

The ammo is 2755f/s is that hot ammo?

Generally higher velocity means higher pressure but it always isn't so. You can have a load that looks safe from the velocity but is over pressure.

Can you take a phot with the primer side directly facing the camera?

 

I have an AR 308 and it's no more harsh on primers than my 5.56.

This best I can do.  Can't up load great quality  pictures 

Head space was checked however I feel they didn't check firing pin . Firing pin shows miss formation  do to heat cutting of pierced primers.  Waiting on new firing pin and will shoot different ammo.  I really suspect it's still over gassed .   I think I need a adjustable  gas block  and since we live in the jersey  it's a pain in the ass because the break has to be cut .