Well, Ill be honest. The Blackies up here tend to run small compared to other blackie territory. A real good bear up here is 250-300 lbs with 400 a god honest trophy. So you dont necessarily have to go too tough, especially if your gonna bait or hound it (which I am assuming since those are the preferred methods up here.) Even though bears are tough the ranges should be close. So I would probably say the 350s are all you will need. I dont know how the two preform out of your gun, but the Hornadys are solid preformers, and the cast bullets should whack them good. Pick the one you like shooting better.
Brian M.