One with the endurance package is the best for shooting heavy bullets and stout loads but in the end even in a fair fight where you see it first the bear usually wins even if it staggers away and dies after the encounter.
This is a little bit off topic but a question for you guys up in Alaska. Assuming that you can't just shoot these things at will, how close does a brown bear have to get before you can legally pop the thing out of justifiable self defense? I imagine they can cover a lot of ground pretty quick.