Fast pistol powders for Bolt gun

[FreeTacos]

I've been loading 300BLK for gas guns for awhile...my goto powders are A1680 and H110. I recently got a 300BLK bolt gun and now that I don't have to worry about cycling, I want to try faster powders for a really quiet subsonic load.

Does anyone have any experience and suggestions on fast pistol powders? I have N320 and Ramshot Enforcer on hand, so I'll probably start there, but also interested in other suggestions.

[popper]

Red dot & WSF for cast. Run a 145gr PB about 1400 fps., decent accuracy off hand in 1:8 CVA SS.

[Roadrunner1969]

I use Unique and HP-38 or WW231 for 190 subx.

[Scoop]

For super-quiet subsonic plinkers, I'm running 150 grain Hornady FMJ's over 4.5 gr of Hodgdon Titegroup or 5.0 gr of VV N320. 2.100 COL in Starline brass. Velocity is 1000-1040 fps (depending on barrel length) with ~20fps Extreme Spreads and single digit SD's. Both loads will shoot sub 2" groups at 100 yards very consistently and with a 10.5 MIL hold, ringing a 12-inch gong at 300 yards is boring.

190 grain Hornady SUB-X's get 8.6 to 9.0 grains of VV N110 (depending on barrel length - targeting 1000 fps) at 2.100 COL in Starline brass. Accuracy is ~1.5 to 2 MOA in multiple barrels.

As always, YMMV.