Vapordog I know how they do it! By shooting 200 groups and having one 1/2" freak in the bunch. The other 199 are 2.5". Of course when you ask, they shoot "shoot around" 1/2" groups. I shoot 3 shot groups, measure my groups center to center and I average the groups. Usually I make only 20 shots at a the range and call it a day.