I built a 358 Winchester on an AR 10 platform Josh with Kurt’s barrel, it’s a real hammer! I’m working up some loads now for that gun, the groups have to be 1/2″ or less before I’m satisfied. I did get my 7.62×39 KAK barreled AR to print under 1/2″ at 100 yards with my pet load, it only took me 3 weeks and 7 different powders to get the right combo this gun likes with a Hornady 123 grain bullet.
I will post the target once I figure out how to upload it to this site, it’s very impressive Josh!