The desert bighorn sheep is usually the last ram of a “grand slam” to be taken, and is often never taken at all. The Desert bighorn can be tough to hunt, but the greatest obstacle is the difficulty of getting a permit… there aren’t many available. Limited permits are available through drawing in Arizona, Nevada and a few other states, but few permits are allotted to non-residents. The easiest place to hunt a desert bighorn ram is Mexico, where good hunts are operated by the government. Unfortunatley though, these hunts are VERY expensive.
Warning: Avoid cut-rate sheep hunts offered by locals in Mexico, as they are illegal, and if brought into the United States will expose the owner to prosecution.