caionneach,
I have used a .308 win and 7mm rem mag. My buddies have used .338 win mag, .300 win mag, 3006, .270 , 35 whelen,and .358 win so far. They are all fine. Shots are usually around 100yds but you would be smart to be ready for a 400 yarder in case a good bull is walking across a frozen lake and is going away from you. The best bull our group ever got was at 430 lasered and it was brought down with a .338 win mag but it is an awsome bull beleive me. The camps up there are all insulated and heated. Nouchimi camps (which we stayed in) are all full electricity with running water and full bathrooms. The camp we always book has 2 bedrooms with 4 bunks per room and huge living spaces, kitchen and bathrooms. These are all bunkhouse trailers left over from when they were building the dams up there. Quite comfortable. The enclosed trailer is the best way to go as the bou can get dirty in an open trailer, which is why we don't quarter them anymore, the meat stays much cleaner. Check your email for a private message.