Just on a note, you seem to be fairly familiar with wild game, but I woud not consider myself a good enough sportsman to use a .270win without at least a good handgun back-up. I prefer the 7mm Rem Mag, but you still have to hit the target for a quick kill. I realize you wil have your truck as well since you aren't hunting the bear but rather keeping an eye out for him. I once had to take 3 shots with my .270 to drop a bear. I was deer hunting, hence the .270, but when I stumbled upon him(quietly as I was following a game trail) he charged. I aimed the first shot, but the next two were more or less "point 'n shoot". I was lucky there was a downed tree between us that allowed me to get off the 3rd round that hit underneath the chin right as he attempted to get over the log.