Horn Seeker,
Yep, I know that area pretty well. I worked for the FS out of the Ninemile Ranger District from 88-90, also spent a fair amount of time hunting in Petty Creek.
The sheep in there arent a push over, although they arent real tough to find either. I've seen the best rams in Spring Creek and Printers Creek. But, they are spread out throughout Petty, even some in the West Fork.
Our plan is to try to look over as many of the mature rams as we can in the first 5-7 days, then select the best one, or one that we like. My buddy wants to shoot a mature ram broomed at 7/8-full curl...score isnt an issue.
A beer sounds good, maybe even a microbrew...get the true Missoula experience.