Sorry guys, I have been unable to access this site since last weekend. I got my adapter and we shot it Friday. I didn't shoot a target for groups yet, but we were shooting at clay birds on boards at 50, 75, & 100yds. We had no trouble hitting them without any sight adjustments. I am liking this adapter. There was a minor amount of blowback: just a very slight sooting of the outside of the adapter. I am not up to real recoil yet, but when I am there will be an in-depth comparison between .30carb/adapter and regular .308 cases using the same cast bullet.