there are 0 (ZERO) laws in Wyoming regarding open-carry. Don't break any federal laws and your good. At 19 you can legally carry a gun, BUT do not conceal as you still need to be 21 to get a conceal-carry permit, and our so-called "constitutional-carry" law still requires you to meet all conceal-carry permit requirements, so if you cannot get a Wyoming conceal-carry permit you cannot conceal.
Wyoming does not have "constitutional-carry" so be careful. DO NOT CONCEAL!
Oh and you can carry loaded, loaded mag and one in the pipe.