Ever had a gun that takes more than one fouling shot to get it to group right? Cleaned a gun until no copper was in the bore. Took it out and shot a 5 shot group. First and second shot were an inch vertically apart. 3rd through 5th were pretty much a ragged hole but about an inch left of the 2nd shot. Never had a gun like that before. It's a buddies of mine and he has probably never cleaned but a few times since he has had it.