 The .333 Jeffery was not intended for dangerous game; however, due to the excellent penetration of the 300-grain round, it has been used successfully on all African game species up to and including elephant.In his "African Rifles and Cartridges", John "Pondoro" Taylor wrote of the .333 Jeffery, "Time and again have I driven it the length of an animal’s body, and cut the perfectly mushroomed bullet out of his hindquarters.I have never had one break up."