I can come close with my inline muzzle loader, I don't know if I could pull it off every time. But I bet out of 3 groups at least one would be 1 inch or better. I don't own a high powered rifle any more, so I can't say anything about that. And from what I can see from my slug gun it would be pretty darn close well with the right ammo. Of course that is after subtracting the diameter of the hole, since one hole is darn near an inch.

I know with my .17 HMR I would be upset if I couldn't get at least 1 inch in good conditions. But like you said, that really doesn't count.

Paul