Two inches at most with some right on top of each other. This .50 barrel is a fast twist and the REAL bullets give me the tightest groups. I haven't tried those type of bullets in my .54 but this has a 1:48 ROT and I get 1 inch groups using PRB at 50 yards shooting from the bench, so that's all I need for shooting a match or for hunting. This barrel handles the Great Plains bullets pretty well but the groups are never better than about 3 inches or so.kbeers said:Im not happy with a two inch group ,the hornady great plain bullets shot a lot tighter than that! Maybe Im expecting too much?I wanna tight group!