Must... not... rant....
Well, I can't hold back... here comes my rant.
I just as big a gun nut as the next guy here, I own several...
BUT... carrying a handgun in the backcountry for "bear defense" is just plain silly and stupid.
First point... bears, be they Grizzly or Black are just not that aggressive. I would dare say I've spent more nights deep in bear country then most here, I worked as a backcountry guide in Yellowstone for 2 summers and the Wind Rivers for 5 summers, along with dozens of personal backpacking trips. I've been up close with black bears and grizzlies many times, and I've never had them act aggressively at all. (Moose are a different story however. )
Contrary to popular belief, bears don't spend all day wandering around looking for hikers and boy scouts to eat, many bears will quickly vacate the area when they sense humans near (through smell, hearing or sight). The bears that don't leave, also don't seem to be bothered at all by people.
I was in a swimming hole in a river in the Winds once when a black bear walked right up, and sat on the opposite bank watching us swim, then after about 10 minutes he got bored and wandered over to a log to dig some grubs. Another time I had a grizzly walk right through our camp at dawn, I woke up when I heard something knock over some gear by my tent, I thought it was one of the boys gonna drop my tent, so I rolled over, unzipped the door and stuck my head out to find it less then 3 feet from a grizzly bear shoulder. I was pretty shocked,
but I lay back down quietly and listened to the grizzly wander around camp a bit, soon enough he left without doing any damage except to a can of deet. These are just two of a dozen or more bear encounters I've had.
Point is that you have a better chance of death or serious injury in the backcountry from dozens of other causes (falling, hypothermia, hyperthermia, poison plants, lightning, bee stings whatever) then from bear attack.
Second point... In the unlikely event that a bear does become aggressive, bear spray is much more effective at stopping a charging bear of any size then any handgun. (bonus is it's non-lethal as well) I know people won't believe me, but I've seen personally what that spray can do when a stupid boy scout decided to let some loose, it is NASTY stuff, several times more potent then the pepper spray the police use. Several accounts tell of bears taking several bullets without stopping, plus when you're scared poopless with a large bear charging at you how accurate is your aim gonna be??? Bear spray however has been very, very effective, and you don't need to aim it, just point in the general direction and let it go. When I was guiding in the Wind Rivers, I was required by the USFS to carry bear spray, fortunately I've never had to use it. But it is lighter and easier to carry then a handgun as well.
If your backpacking in USFS designated wilderness land, or National Parks they usually have their own laws against firearms anyway. (which I don't agree with but that would get rule #14) Besides who wants to carry that extra weight anyway.
Summary... if you really want protection from bears and other wild animals in the backcountry, be smart, give wildlife plenty of space, don't get between a sow and cub (or food), store you food and smellables properly,
AND leave the gun at home and spend $70 on a can of bear spray instead.