I have shot the No excuses, 460gr, .503s out of both my Knights. Bighorn .50 w/26in bbl and mk-95, 22in bbl. I use 80gr 3f swiss and 3f goex. Very acceptable accuracy 1.5-2.5 at 100meters. Hang on though they will get your attention!! that was w/a scope though. Wouldn't be afraid to shoot that far w/a peep or open sites! Thinking of backing down to 70gr swiss.