175 SMK Subsonic Load Data Help
 

I just got a 300 BLK barrel for my AR (16", Carbine gas system) and formed my first 300 BLK brass from 223 brass last night. I've got some 175 grain SMK's at home and some Ramshot Enforcer. Does anyone have load data using these components please (preferably subsonic)?

Thanks alot for the help,

Enforcer should be very close to AA2400. Sierra reload data shows 1200fps for 175gr MatchKing with 11.6gr of AA2400. I would start there and work your way down to subsonic load.

AA1680 or Alliant 2400, there is no AA2400...please be meticulous and also represent an OAL as there are significant implications.

If loaded to an OAL of 2.10" you would still have to be under 50% load density to reach subsonic.

You may want to consider a heavier round for both higher load density and slower overall speeds.

Sorry if you already know this, but it won't cycle. You want 220 grain or more with a powder like A1680 to cycle optimally.

I use Hornady 178gr A-max to cycle a carbine gas system with a .125 gas hole, using 10.1 gr AA1680 going 935 fps. Alliant 2400 would not cycle subsonic in my rifle.