On the inlaw' ranch, we all carry a single action big bore revolvers on horseback, in the trucks, we carry a centerfire .22. I recommend a .22-250 or .220 Swift (I have a swift and wouldn't trade it for the world) a .30'06, a 7mm Rem. Mag, or a .300 Win Mag (kinda hard to find the shoot 'em in the toe and drop 'em SAUMs and WSMs in WY except for Casper and Cheyenne, lol!). I also highly recommend a Single action revolver for the cats and bears. You don't want to be hauling a rifle around everywhere, and the only time you can kill them without a license, they better be in pistol range and showing canines when the game warden's find them, heh heh. As far as the pistol goes, get a .44 Rem Mag. You can find .44 Mag, and any of the "Old" rifle calibers like the .30'06, 7mm Mag, etc. anywhere in WY