Im so glad this thread has been resurrected. Its a great topic for those of us who love the woods. Back in the day when gentleman hunted Tigers, they rode in a saddle chair mounted on Elephants. The saddle was called a HOWDAH. It seems Tigers often took offense to being hunted and would often climb up the side of the Elephant, which didnt make the Elephant especially happy.
The hunter might find his rifle awkward to use at close range against a rampaging Tiger on a stampeding Elephant, and thus the Howdah Pistol was born. Back then it was a double barreled handgun with 6 to 10 inch barrels in a LARGE bore. Think sawed off SxS shotgun (but usually rifled) in something like 50 or 60 caliber firing a solid round. Typically they were hung from a loop on the butt at each corner of the saddle; but they could be carried in a holster
This scene from The Ghost and the Darkness is fictional but still cool. In the movie Michael Douglas carried his O/U Howdah Pistol in a western style holster.
Bringing history to life I carried a 6 inch SxS 12 gauge on a belt holster for the better part of a year as a concealed carry pistol, so it can be done.
In a modern sense I do like the Big Heavy cartridges starting with 454 Casull. Im a huge fan of the guns from Freedom Arms. They are single action but I think still usable. Many will suggest 44 Magnum and I dont think they are wrong I like heavy hitters firing SOLID bullets for dangerous game. Ive been toying with the S&W X frame in 500S&W in the short(er) 4" model (the compensator adds another inch)
There is a shorter 3.5" model but the gun is still huge and I think the slightly huge(er) 4" + comp balances better in a belt holster, although the 3.5" might be nicer in a chest holster. Which brings up the issue of HOW you carry the gun.
The folks who opt for shotguns or rifles are forced to carry or sling the LONG gun. Long guns offer more stability at longer ranges BUT how far can you justify shooting the bear? Long guns are also more awkward at CLOSE ranges during a charge. Its at that close range where POWER and the ability to maneuver matter, so I think a Bear gun needs to be a handgun that can be carried. If I had to carry a Long gun for Bear defense it might be a Tac-14, possibly even in 20 gauge with slugs to make it easier for follow up shots.
Folks that suggest the Desert Eagle must have a better way to carry them then Ive found they can make the S&W X frame look small. Too big and Too heavy often mean being left behind or too slow into action. That being said I do very much want one, just not for Bear defense.
I wouldnt say NO to a Glock 20 as I know there are lots of fans of 10mm and 15+ rounds of 10mm is a lot of Go Away; but personally Id prefer bigger if I was in Brown Bear country