The way I look at a 'bear gun' ….as discussed many times when hunting with Jim Maloney in Canada…is like this:
1. Even large bore rifles are considered to be marginal when coming up against a bear intent on killing you.
2. Then you have the primal fear setting in if suddenly coming face to face with a bear charging you or ambushing you out of the woods.
3. There is a pretty good chance that rifle fire at any ambush range will miss the target under the extreme fight or flight you [any of us] would experience.
4. Trying to hit a bear from even a short distance with a handgun is even more difficult.
5. You won't be hunting bears, but you will carry a 'bear rifle' and a 10mm pistol as 'back up' _
6. Should you suddenly find yourself up against a bear…if there will be any time at all to get a weapon into action…it will be your Marlin lever rifle.
7. A back up handgun is something you will have easy access to…in an emergency when a bear is almost on top of you and you won't be able to use the rifle.
8. At this moment and with no extra room to move feely…you will want a small powerful handgun with hard cast bullets [bear loads] that will penetrate deeply when fired at the bear's body/head/face…a foot or so in distance….when you are in the convulsions of primal fear.
9. Here I would prefer a small powerful handgun with a short barrel that won't get in the way ….
10. So the Glock 29 is just about perfect in 10mm.
Again, what use will you put the safety bullet