I've got a 7" 458 socom upper on a pistol lower and I'm waiting on my Form 1 to come back so I can make a SBR. The 458 is a 530gr subsonic expanding bullet. Recommended twist in the socom is 1 in 14 or faster. It came with the 225 Whisper bullets I ordered
Now if I could get one of you fine guys to build a suppressor for me I'd be set