Todays Ruger Bisley, Blackhawk, Redhawk and todays 92s and Marlin's 1894 ain't your daddy's .45 Colt !
Wyoming Game and Fish Commission
Section 4. Firearms and cartridges that are legal for the taking of big or trophy game animals.
(a) Wyoming statutes authorize the use of a firearm which has a barrel bore diameter of at least twenty-three-hundredths (23/100) of an inch and is chambered to fire a center-fire cartridge not less than two (2) inches in overall length, including a soft or expanding point bullet seated to a normal depth, or a muzzle-loading rifle which has a barrel bore diameter of at least forty-hundredths (40/100) of an inch and a charge of at least fifty (50) grains of black powder or equivalent, or a muzzle-loading specialty single shot handgun which has a barrel length of not less than ten (10) inches, a bore diameter of at least forty-five-hundredths (45/100) of an inch and which propels a projectile of two hundred forty (240) grains at not less than five hundred (500) foot pounds at one hundred (100) yards.
(b) In addition, the Commission authorizes any other cartridge fired from a firearm that has a barrel bore diameter of at least thirty-five hundredths (35/100) of an inch and the cartridge generally delivers at least five hundred (500) ft-pounds of impact at one hundred (100) yards and cartridges used are loaded with a soft, or expanding point bullet.
Load er' up and make meat!!