Buffalo Bore loads their ammunition up to maximum SAAMI specifications, which delivers devastating performance on a wide range of game. Please note that this ammunition is not intended for older guns. It is made for modern firearms only, as some of the ammunition could damage older and weaker firearms. This is a very hard cast bullet and is not designed to mushroom at intended impact velocities. It has been known to penetrate up to six feet in game animals and is therefore useful for animals up to 2,500 lbs. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.