For myself I've found that when I'm inconsistently off like you were there it's usually me. You have two in one hole in the center, one left, one right about equidistant. That for me almost always is the result of an error from behind the gun rather than with the gun.I'm not going to write off your suggestion. You may be very accurate in your observation. I think that works out to be about 3/4 inch. I picked up some Sweet 7.62 or whatever it's called. Thinking maybe the Butch isn't cutting it. I'm cleaning it this evening. I am going to start with 38gr of Varget and 2.24" and go up and down .003" until I hit a sweet spot. 38 isn't pushing it super fast but I will take accuracy over speed.
I picked up a box of Sierra 140 Spitzer Boat Tails and may try those out. I have about 115 down the tube now and I'm getting nervous that I'm struggling. I never had cheek weld issues before but anything is possible.