#1, stay away from a semi auto if you are getting it as a backup piece for Alaska. #2, 10mm is NOT a caliber I would suggest for anyone to carry for a Bear defense firearm against a Brownie. I actually wouldn't suggest anyone to carry a sidearm for Brownie defense period unless you have tons of practice shooting a a bouncing tennis ball because that is around the size of the target you will have to connect with. Not to mention the speed that that freight train with teeth will be coming at you. If you do decide on a sidearm instead of a 12 gauge SG loaded with slug, 00buck, slug combination, then I would have to recommend something in .44mag or bigger. So when you DO miss that tennis ball sized target coming at you, an believe me when I tell you, you WILL miss, at least you just might have a powerful enough round to deter that massive furball enough to give you another shot.