Definately check the legalities of carrying a handgun while archery hunting in archery only seasons/hunting units.
If it is not legal...bear spray.
If it is...then read on.
I would look at the SW 329 (44mag). Very light weight, great for just in case carry. Won't get too heavy (because if its too heavy, you won't carry it, and if you don't carry it...its a good as useless). Recoil is going to be severe, but, I wound not suspect that it would be any worse than getting mauled by a bear/mountain lion. I have shot the heavier weight/lower caliber .357 version of this gun and highly recommened it.
Here is a link to a picture, hopefully it will connect, couldn't make it post the picture in my reply.
http://www.smith-wesson.com/wcsstore...3414_large.jpg