I got 2-3" at 50yds with my BH 44 mag. It had a Trophy TR25 3 Mil dot I believe.

Same gun would do that at 100yds with a 2X Burris so I think the 3 mil dot adds some movement to the mix-- also zero magnification.

I also have these on a couple 1911s. The Springfield 45 shoots 2" at 50yds all day long. You are lucky to get 8" out of the Rock Island 9mm at the same range.

Lot depends on the gun, load and the shooter.