No huge chronographs, no paper at 40yard stuff, just a shell to shell, hunt to hunt comparison. My shots are never no further then 40 yards, most are 25-35 yards. Birds varied from mallards to Eider. Bought six boxes of #2 3" Hevi X and six boxes #2 3" BC, newer BC. I was not that impressed with the Hevi X, I flat out killed more ducks and crippled less ducks across the species with the BC. I had higher hopes of the Hevi X doing better. But even on the tougher Eider and Scoter, we had zero cripples with the BC, chased four cripples with the HX. I don't know why, my guess is the irregular shaped HX, there isn't one pellet round, some shaped like rice, some blobs with two or three nipples.