Karamojo Bell used a 7x57 Mauser to shoot his 1,011 elephants (although it was called the .275 Rigby, it's the same cartridge). I love the 7x57 for the smaller stuff in Africa—gazelles, impala, warthog—but I shot a big old croc with this gun as well. A brain-shot is a brain-shot, so the caliber doesn't make much difference. This rifle was built by Sterling Davenport in a small-ring Argentine Mauser.