My whole point in the question was that you are in a sort of survival situation (maybe even self imposed.) and you gun would feed you. My choice of a .22 mag rifle was based on the foolowing things. It is light and handy You could always have it with you giving you abetter chance of tarets of oppurtunity. How may times have you been walking to your stand or blind and you kicked up a rabbit or saw alot of sqirrels? I think rimfires have probably accounted for much more game than centerfires, albeit probably not more sheer poundage of game.
Also with a rimfire you could take ALOT of ammo which I like because I Miss alot LOL.
CMA3366a had agood suggestion with a CZ 427 in 22 hornet. Didn't think of that one but it is about a perfect choice.