I would take a look at the 300 grain XTP. As long as it functions thru the #92 action, you should be good to go. Look for around 1500 or more FPS out of a rifle length barrel. Plenty for black bear. If recoil is an issue, then the 225 Barnes might be a better choice. A well designed hard cast slug will work as well, giving you maximum penetration. In an animal the size of a black bear, I would opt to take advantage of the rifle barrel velocity advantage with heavy jacketed bullets, combining good expansion with deep penetration. I have taken a couple of bear with both cast and jacketed big bore handguns, and they all worked about the same.....Dead bear within 20 or so yards.
Larry