Not a centerfire, but a Keltec PMR 30 makes a great backpacker gun.
Spend the time to learn to load the magazine correctly, shoot it accurately, and it is something to contend with.
31 rounds x 320 ft/lbs muzzle energy = not that bad
And you can shoot a squirrel or a grouse for the pot with a fmj without much meat destruction.
The fmj's work pretty good on hogs to boot!
(It weights about 14 ounces empty)
A follow-up 2.5 years later after I created this thread.
The lady chose not to have a firearm at all on her hikes, but she did accept a gift of some pepper spray.
Her teenage son will accompany her on many hikes, and in the woods he'll probably be carrying a belt knife with a 6 inch blade.
I just fondled a Kel-Tec PMR 30 earlier today at a pawnshop, and it felt really good. Super light. Long enough barrel to give it a good balance and pointability. Excellent fiber optic sights.
The grip is long, front to back, to accommodate the 22 magnum cartridges but it is not thick, not bulky like a Glock or a Beretta M9. It's similar to a 1911 with slim / low profile grip panels.
That's got to be one of the best self-defense and survival handguns out there for a hiker especially when you consider how little the ammo weighs,
& how easy it would be to have 30 in your gun and maybe another 30 in a Ziploc bag in your backpack.
(Shooting a gun as a distress signal after you're missing and you know people are looking for you can be useful, but if you don't have a bunch of ammo on hand you'd probably be reluctant to use it, fearing it might be wasted just making noise.)
