You forgot the most powerful of all. The deadly 5.56MM. Fired from an assault rifle a single round will kill a man at a range of more than two miles just by passing within inches of the head. Large capacity magazines can be fired in a microsecond killing everyone in a one-mile radius. Exit wounds are reported to exceed the size of small watermelons. Capable of penetrating battleship armor, nothing or no one is safe in the mere presence of a weapon loaded with this cartridge of mass destruction.
Frankly, I don't know why the military uses are those other inferior rounds.
