Came across a grizzly sow and cub once while archery hunting for elk in Wyoming. I carried pepper spray and my guide had a .357. Fortunately we saw her quartering away from us about 100 yards away and she was upwind. We slowly backed the hell out of there. I felt naked with the pepper spray in my hand...
Dan:
Question: What is best technique for using a pistol chambered for .380 ACP as defense against a charging black bear?
Answer: Sticking pistol into bear's mouth or ear, depending on position of shooter, pulling trigger repeatedly until SECOND TO THE last round is fired, followed (if shooter is still alive) by devout prayer and application of tourniquet(s).
Save last round for yourself...I don't think being munched on while breathing is an experience I would enjoy very much.
Be sure to take the .454 along when in bear country! :) ;)
(http://s575.photobucket.com/albums/ss197/kjtrains/454CasullAlaskan-a-1.jpg)