What rounds of Elephant ammunition are common across Africa?

Elephants have been traditionally hunted with bolt action rifles, most of which were either military or derived from military designs, or with purpose-made African game rifles such as high-end double rifles from manufacturers such as Holland & Holland.

Common military calibers from the colonial times in Africa were 7mm Mauser (7x57) and .303 British. Hunters today no longer favor those and generally use the larger calibers made just for hunting.

Common specialty hunting calibers are 9.3x64, .375 H&H Magnum, .404 Jeffery, .416 Rigby, .450 Nitro Express, .458 Winchester Magnum, .458 Lott, .460 Weatherby Magnum, .470 Nitro Express and .500 Nitro Express. .600 Nitro Express and .700 Nitro Express are also not unheard of.

Poachers not concerned with ethics of hunting may use any of the myriad surplus military arms floating around Africa from the many conflicts. This can literally be any caliber from 7.62x54 to .308 to 8mm Lebel.