What military cartridge has killed more enemy soldiers than any other. That ought to produce a spirited debate! It must be a self contained metallic cartridge, no muzzle loading paper cartridges allowed. A black powder round like the 577/450 Martini, qualifies. The .318 and the .323 diameter 7.92X57 rounds shall be counted as the same round. I have no idea. I'll start things off by hazarding a guess......the .303 British?