I have one of my 336's in 35 Rem shooting .8 groups at 50 yards. When I back it up to 100 the groups open up to 4+ inches. Ive tightened down the barrel bands, used 2 different scopes/ring combos. This has happened with 2 different types of ammo(both sub moa at 50 yards) Holes appear to be round. What am I missing here? I half expected to double in group size, maybe a bit more but even the groups arent really groups. The only thing i can think of is maybe some imperfection in the crown that I cant see. I would imagine this would also cause my groups at 50 to be larger as well though, or at least inconsistent.
