If just one powder and projectile primarily for subsonic hundreds seems to work for .three hundred Blackout that will be fantastic. If it turned out to that CFE 223 could fill that purpose that would be the On top of that worlds. Just caution when hunting with .300 Blackout subsonic https://300-aac-brass22229.vblogetin.com/44479848/getting-my-300-blackout-brass-to-work