Hello all! i recently bought a .308 WIN and i know that can do elk and below but what about higher game like moose or caribou or even buffalo? I know the limits of a .308 are elk but i would like to go higher some day. What is a larger caliber gun that could possible be used for something as small as deer too? Can my 50 cal muzzle loader help at all? Thanks in advance

(also, are 30-06s and .308s different much?)