I would hate to state.. a .50 caliber is good for Xdistance. Killing wise, I know they can do it out to 100 yards, but that again boils down to shot placement. The .54 caliber I think has a little longer range to it then the .50. I would again stress only as far as you are able to place shots. For me that is 100 yards. For someone else, that might be further like 125 yards.