I am with you on the grand slam. I don't think you could do all 4 as a diy hunt. if you are a usa citizen you can't hunt stones with out a guide. foriegn country, and if you don't have a immiediate family member in alaska you could not hunt dall sheep diy in ak. that law sucks in my mind.
i think the closest a person could come to that would be, to be a citizen of british columbia, they have dall, rocky and stone. then pull a desert tag from a usa state.