I installed a red dot on a Ruger Super Blackhawk . .454 casull. I followed the advice of a member and put the target 5 yards away and fired, figuring at that close range it would surely hit the paper. Turns out it was a bullseye. I backed it up to 10, 15, 20 yards, and it was grouping nicely about 2" high. Could have been me since I was shooting offhand. When I can get to my outdoor range, I'm anxious to see what it will do over a rest. For now, it will work on a sassy bandit or charging bear.....That's if I don't turn into Barney Fife if such an occasion arises.