you can use an AR-15 in .223 for deer, antelope, mountain lion, and gray wolf in WYOMING

[HBARleatherneck]

Cartridge and Archery Equipment Regulations Liberalized for Big Game, Trophy Game and Turkey

http://wgfd.wyo.gov/web2011/news-1001268.aspx

just came out 1-28-2013. A big FU to the Feds. Yes you can hunt with the evil assault rifle. At least in the FREE STATE of WYOMING.
have to use at least 60 gn bullet.

• For deer, antelope, mountain lion, and gray wolf, the major change is the addition of .22 centerfire cartridges as legal ammunition. For the taking of deer, antelope, mountain lions, and gray wolves in areas where they are designated as trophy game, hunters can use any centerfire firearm of at least .22 caliber, using a cartridge at least two inches long and firing a bullet of at least 60 grains.