Neither the .45-70 or the .30-06 should be considered all-purpose rounds for African hunting. A fellow could do alright in the bush with a .45-70 on up to 500 pound plains game and the same thing can be said of the .30-06... but the thing is that neither is adequate for larger game. I'll take my .375 H&H or even the 9.3X62 over either of the traditional American cartridges that were not designed to do what you are asking them to do.