(a) For the taking of bighorn sheep, elk, moose, mountain goat or black bear by the use of a firearm, a hunter shall use: - (i) Any center-fire firearm of at least .24 caliber and firing a cartridge of at least two (2) inches in overall length, or any other cartridge of at least .35 caliber and at least one and one-half inches (1.5) in overall length, and using an expanding point bullet; or,
- (ii) Any muzzle-loading rifle or any muzzle-loading handgun of at least .40 caliber and firing an expanding point bullet or lead ball and using a charge of at least fifty (50) grains of black powder or its equivalent; or,
- (iii) Any shotgun firing "00" or larger buckshot, or a slug.
(b) For the taking of antelope, deer, mountain lion, or gray wolf where designated as a trophy game animal, a hunter shall use: - (i) Any center-fire firearm of at least .22 caliber (excluding .22 Hornet) and having a bullet weight of at least sixty (60) grains and firing a cartridge of at least two (2) inches in overall length, or any other cartridge of at least .35 caliber and at least one and one-half (1.5) inches in overall length, and using an expanding point bullet; or,
- (ii) Any muzzle-loading rifle or any muzzle-loading handgun of at least .40 caliber and firing an expanding point bullet or lead ball and using a charge of at least fifty (50) grains of black powder or its equivalent; or,
- (iii) Any shotgun firing "00" or larger buckshot, or a slug.
(c) For the taking of a grizzly bear by the use of a firearm, a hunter shall use: - (i) Any center-fire firearm of at least .27 caliber and firing a cartridge of at least two (2) inches in overall length and using an expanding point bullet of at least one hundred fifty (150) grains.
- (ii) Any muzzle-loading rifle or any muzzle-loading handgun of at least .50 caliber and firing an expanding point bullet or lead ball and using a charge of at least one hundred (100) grains of black powder or its equivalent; or,
- (iii) Any shotgun firing "00" or larger buckshot, or a slug.
040-32 Wyo. Code R. § 32-4