Problems with suppressed short 300 blk bbl

[pyplynr]

I have put together a 300 Blackout with an 8" barrel. I'm using my Tbac 30p-1 with it 100% of the time. It has a standard carbine buffer spring, H2 buffer, and standard carrier. Here's my problem. Using subsonic ammo it runs flawlessly. Supersonic ammo it runs like crap. Some of the supersonic rounds will blow the primers out of the cases. Also it doesn't feed very well. It will pick up the round from the mag, but it won't feed it correctly and it jams. What are the fixes for my problem?

Edit to add: it also ejects the brass to the 5-5:30 area if that matters

 

[346ci]

Re: Problems with suppressed short 300 blk bbl

Contact or send "rsilvers" a PM here, he is R&D for the BO.

 

[country888]

Re: Problems with suppressed short 300 blk bbl

Whats the barrel & ammo maker?

 

[pyplynr]

Re: Problems with suppressed short 300 blk bbl

It's a Rainier Arms barrel and the ammo that has problems is 147 grain ammo from Southwest Ammo.

 

[pyplynr]

Re: Problems with suppressed short 300 blk bbl

Anyone else have an idea of what to try?

 

[Captain Moroni]

Re: Problems with suppressed short 300 blk bbl

I was getting a huge back pressure boost with 147's and a Spikes MRS/2. I was getting a fire ball coming out of the ejection port. I switched to a 7.62-SD and that cured the problem. I never had a primer blown out that I know of.

 

[Glen Seekins]

Re: Problems with suppressed short 300 blk bbl

Have you tried different super sonic ammo? Reason i ask is because i had a whole bunch of that stuff that wouldnt feed. Brass was out of spec and velocity was all over the place.

I would try some quality factory ammo and make your baseline off of that.

 

[tiNdvenTFHwMdqKW]

Re: Problems with suppressed short 300 blk bbl

I know that I have to adjust my gas block between sub and supersonic. It's two different animals as far as my AR goes.