When I learned I would be fishing in Alaska about 20 years ago, I did my research and bought a Freedom Arms 83 in 475 Linebaugh. After shooting the dang thing quite a bit, I decided that if I needed to fire on an aggressive bear, I would likely crank off the 1st shot into the ether, then be in full recoil posture, barrel pointing skyward, when the bear leveled me.
I now do a lot of fishing alone in SW Montana. Instead of the 475, I now carry a Glock 20 in a Kenai chest holster and a mag full of Buffalo Bore 190 gr Mono-Metal loads. As I understand the thinking on the 10mm, a hit to the central nervous system (brain, spinal cord) is needed to incapacitate a bear intent on ruining your day. So a bullet that tracks straight and penetrates deep is the key. And in order to hit the CNS, multiple shots quickly fired increase the odds of succeeding. A 10mm in the G20 seems the best compromise of power, penetration, and controllability.
I am also much more likely to practice with my 10mm than with the 475. 5 shots with the 83 and I'm done for at least a week. Wrecks my nervous system and my budget!
This post is a bit off topic. To bring it around, If I were hunting black bears I would definitely take the 475.