[QUOTEYes this is for a .357, and would be sighted in at 50 yards... so a 3 MOA dot would only cover 1.5" at that distance, but in my hands, that should be just fine... a sniper we are not][/QUOTE]
Just so you know, you aren't limited to the size of the group you can shoot by the size of the dot. I can shoot sub .5 moa groups with a couple of my rimfire handguns with red dots at 50 yards. If you center the dot over the point of aim, you can shoot some really small groups with an accurate gun. Don't get hung up on dot size. Smaller is better in the sense that it doesn't cover up too much, but a 3 or 4 moa dot is a very good size to shoot small groups with.