My BCM SAM-R barrel loves the 40gr Nosler ballistic tip over 28.0gr of Benchmark at 2.260" OAL in Nammo Tactical brass with a Federal AR Match primer; 3,594 FPS average and it was putting every bullet through a 1" Birchwood Casey target sticker.
(EDIT: typo, corrected powder charge to 28.0)
Accurate 1680 or Shooter's World Blackout are what I use. I have a load for 1680 and a 220gr Berry's that cycles my AK suppressed and is stable and quiet.
I run many presses, but my Dillon RL1100 with Ammobot Rev3 auto drive makes a straining sound when CBC cases are being sized or crimped. I add a couple of sprays of lanolin alcohol mix to the brass and that completely goes away. It just has to be better for equipment longevity.
My 9" Ballistic Advantage 300BLK barrel is very accurate, and it will take longer loaded ammo. My PSA JAKL and Ruger American Ranch in 300BLK are picky about how long I can load ammo for them.
I could not get my Vibra Prime to work with large pistol primers, they would hang up and never drop into the tube, so I ordered a DAA Primafill and it works much better.
BE-86 is one of my favorite powders, but you will have to reduce their listed charge for a 147 if you want subsonic. Every round that I loaded with 5.1gr was supersonic out of my 8" PCC.
I run a lot of it. It is very low flash and works great in self defense loads. In 9mm I load 5.1gr under a 147gr HST, which is slightly +P and get 1050fps from a typical handgun barrel length. Superbly accurate.
Smells awesome when burned.
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