I would gladly sacrifice some of my hearing to not be dead.

Pack as much caliber as you can handle.

pnut....when it comes to stopping a Canadian brown bear in his tracks, the .45 ACP would be nearly as useless as a rolled up newspaper.

For most situations, the .45acp is a fine round (one of my personal favs) however it is way under powered as a bear defense gun in BC Cowboy's neck of the woods.