i thought there was something in the geneva convention about using a a limit of a certain caliber /mm size on infantry?
Well, I know for a fact that we've used things as large as 16-inch naval rifles to fire H.E. at enemy troops, and no-one once complained about violations of any of the Laws of Land Warfare..... and we routinely use 8" howitzers, 155mm artillery, MLRS, 120 & 81mm mortars,etc.