Jan 28, 2013 - Effective immediately, .22 caliber centerfire cartridges at least two inches in length and using at least a 60-grain bullet are legal hunting calibers for deer, antelope, mountain lions, and (trophy area) gray wolves. The .17 HMR is now legal for turkey hunting.

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