Hey BeerSlayer,
I know that the Anchor D outfiters are great people and will take you in on a mountain hunt with horses and wagon. Lot's of fun and great bulls up in the country that they are hunting. It is a family run business and Dewie Mathews is a first class guy.
http://www.anchord.com/
Another name to look up is a guy named Mark Parsons who lives west of Nanton. He guided a guy a few years back to a 390" bull and is also a great guy.
ANCHOR BAR EXPEDITIONS
MARK PARSONS
Phone: (403) 646-5714 / Fax: (403) 646-5715
Spc. Black Bear, Elk, Mule Deer, Moose, Whitetail Deer
Best of luck!!