My comment on the Linebaugh as well as any other large magnum cartridge is that followup shots, effectively placed take much more time than one would likely have. Therefore not an optimum choice. a 10mm semiauto with substantial capacity would be better since it can be controlled and several well place rounds are possible. If I were in that environment I would opt for a short semiauto 12 gauge with some solid copper slugs which will drive deeper than lead slugs or something like the 375 Ruger guide gun with dangerous game heavies but then you're limited to just a few rounds and quickly manipulating a bolt gun under stress ain't easy. A Browning semiauto 300 win mag with heavy solids may work as well but ti's a lot to tote as a JIC weapon. I've been in tose environments in Colorado and Canada and seen some amazingly huge grizzlies in Canadian Rockies. A 50 cal M2 wouldmake me feel safer but I ain't John Wayne and this ain't Hollywood.