My grandfather said that you didn'r really need more shootin' irons than you could swim the nearest river with.
I agree. One rifle, and one sidearm. I definitely can't swim a river with an 81mm mortar tube.
However, he did not follow his own advice. And he didn't mention anything about how much ammo.
He didn't drown, did he???
55.56mm
5.56mm
He didn't drown, did he???
Nope, and that's not generally much of a consideration in New Mexico where he came of age, nor in Wyoming, where he later homesteaded.
He was, however, a Navy man during WWI. THat may have been an influence.