As to the judging aspect, its all the same concept no matter if its a sheep in Montana, Wyoming, Colorado, New Mexico, Arizona, or Utah.
The only thing you need to consider is the average mass and horn length on the rams you're hunting. If the area you draw has rams that only have 15 inch bases on average, consider that and use that as your baseline. But, from there, judging how well they carry that mass, how old they are, etc. is still the same. To get the best scoring ram in the area you're hunting, even if its NOT a B&C contender, you judge them the same way.
Also, the suggestion of trying to find those judging videos from Duncan Gilchrist isn't a bad idea. Again, the way you judge a ram is the same and his methods described in those videos is relevant no matter where you hunt.
I knew Duncan fairly well, a good friend of mine was his neighbor. When Duncan was writing his book on dall sheep, he wanted to use pictures of my ram, but I declined. He was always fun to chat with about sheep and goats.
I would also suggest, like others, that you spend significant time looking at the sheep in your area as much as possible. When I drew my desert tag in Arizona, I shot my ram within the first hour of legal hunting light. I did all my "hunting" the 2 weeks prior to the season opening and knew exactly what ram I wanted after looking over a vast majority of the rams in the unit.
I never scored that ram, but it was scored pretty close by the AZGF when I checked it at Kingman. It was 165 and change gross green IIRC.
A few pictures:
My ram is the one on the right, 3-4 days before the season opened:
My ram again:
This one was a cool ram too, and one I would have been happy with: