I shot many years in competition at ARC. I have my own range at home. But I work full time and volunteer EMS and Fire locally so there isn't much free time anymore. And I doubt I can shoot anywhere near as good as I could when I was tuned up.
Tell Paul and Rex and the whole bunch at ARC at the highpower matches hello! BTW if you want to see consistent tight iron sight groups watch Paul shoot when he is shooting his match rifle AR. His eyes kinda suck for service rifle post, but match rifle irons are a whole other ball game.
9 twist should shoot almost any bullet out there, from 40s to most 80s. If its opening up I'd question either the twist or that its not a top line barrel.
