Hello
Thank you for bringing this question up as I have wondered about it myself. I don't own a .357 Magnum yet, but it is in my future plans. I think a .357 Magnum would be a good choice for an all round revolver.
I recall hearing a while back that Buffalo Bore made 180 grain Hard Cast .357 Magnum cartridges that would penetrate a Brown Bear's skull. I think a .357 Magnum would be about the low end of what I'd trust for using on large carnivores in a last ditch senario (I really hope I don't have to kill a bear in the first place).
When I lived in Alaska I did not own a revolver, so I'd go backpacking unarmed and I came back in one piece everytime. I saw a few moose up closer than I wanted to, but not any bears, Brown or Black at a close range. But I think I'd had a much easier time getting to sleep if I did have something with me at the time...LOL. Tossing and turning in my sleeping bag my thoughts turned to the No.4 Mk.I* Lee Enfield Rifle that I left in my cabin...LOL. Needless to say, the "Bloke up Topside" got to know me a little better...LOL. So next time I go back I want to have at least as powerfull as a .357 Magnum. Also thinking of a compact 12ga Shotgun and load with slug, heavy buckshot, slug, heavy buckshot, etc. as well. So thanks once more for bringing this question up, been wondering myslef.
Thanks
Mark