Love these bear threads, something about terror I think.
I've seen Blackies in the U.P but they seem to want to get as far away from me as fast as possible. Still one never knows when you might meet a grumpy one. While they don't compare to brown bears I have evolved from carrying a 6" model 629 to a 4" 625 in .45 colt stocked with a 300gr. cast bullet at about 1000fps. I don't shoot a lot of these out of my Smith, just use them for wood's situations. My thinking is big bullet less recoil.
Remember the first shot is single action for accuracy the next five are double action while he's chewing on your head.