From what I gathered, .72 is apx. equal to 18.5mm, like that of a 12 gauge slug. It is a handgun meant for larger races, such as Giants, Draconians, Yetis, and Orcs. Though you haven't been around my account long enough to figure out what the Hell I am talking about.
The Kingdom of Anopia (my dad's imaginary land he made up when he was young lol) is the strongest and most advanced military power in Alysium. 2 million men. Compared to Xetronuvia's 876,000 men... well yeah. X3