This would be for a worst case scenario in that you are forced to leave your home and flee to the wilderness with people possibly pursuing you. I would assume you could harvest enough birds, squirrels, rabbits and other assorted critters to help you survive. And I also assume it would be quiet enough to not give away your position as well as you being able to take several thousand rounds with you.
What are your thoughts on this idea?
Does anyone have any experience with airguns that they would be willing to share? Any recommendations for a great airgun?
As mentioned before, air rifles can last quite a long time as long as you take care of them. If you get a "springer" (single-stroke pneumatic) make sure that you don't keep it cocked for extended periods of time, as the spring will take a set and you will loose power. I have a .22 Beeman RX-2 (
http://www.pyramydair.com/cgi-bin/model.pl?model_id=568) which is a different variation of this type of rifle. Instead of a actual steel spring, it uses a gas piston. With this system you can keep it cocked and loaded as long as you want. The downside though is that this rifle is a whopper at 10 lbs!

I use it mainly for target shooting with a rest, and get 1.5"-2" groups at 50-55 yards with a scope. I've used it a few times to take small game (rabbits & ground squirrels), but get tired of it really quick due to the weight. I really like the fit and finish of the higher end Beeman's and think a R9 in .177 (
http://www.pyramydair.com/p/beeman-r9-air-rifle.shtml) would work great for the situation you mentioned. The .177 would take rabbit sized game with head shots and easily take squirrels and birds. This rifle also come in .20, but I would avoid that as it is not a very common caliber. You can find it easily enough on the web, but I very seldom see it in my local sporting goods stores. With either types of single stroke pneumatics (spring or gas piston), remember to never dry fire them, as you can damage the gun in short order!
Another option would be a multi-Pump pneumatic, such as one of these Benjamin Sheridan's (
http://www.pyramydair.com/cgi-bin/show.pl?cmd_rifles=show_guns_manufacturer&Manufacturer=Benjamin%20Sheridan). The advantage to one of these is that they are light and you can keep it pumped up and loaded with out worrying about a spring taking a set. Recoil is also non-existent and they are very easy to shoot accurately. The downside is that you would have to pump it multiple times to to reach the same power level of a single-stroke pneumatic and they can also be much louder (depending on how much you pump it up). When the rifle is not in use, it is also good to store it pumped up with one or two strokes. This keeps the rubber gasket on the air valve from coming loose over time. There is a guy over here in California that sells modified Sheridan rifles. He beefs them up and modifies them to take more pumps, which mean more power. I really want to get one of these in the near future! Here's a link, (
http://www.mac1airgun.com/steriodags.html)
With whatever air rifle you choose, I would say the max distance you should attempt to take game at is 30-40 yards with open sights. You might be able to extend that range a bit with practice, and/or a scope, but the kill zone on small game is pretty small. If you wound the target and it runs off, good luck trying to get a follow up shot!

Its best to make sure you can make one shot kills. Anyhow, hope this helps and remember to be safe!:thumbup: