Re: Pellet guns and low tech archery for survival.
The Crosman Nitro Fury in .22 cal, has proven to be a great gun thus far James. The trigger pull is heavy, but there are several mods available on the web that illustrate how to alleviate this problem, I just haven't got around to it yet. That aside, it shoots amazingly well. I can tear a smaller soda can (Red Bull) to pieces at about 60 paces, even with the terrible trigger pull, and with all shots more or less centered on the small can. The gun is very quiet, and has enough power to easily take down small game such as rabbits, squirrels, etc.
Didn't come with a scope as it was said to, so you have to watch out for this sort of thing sometimes with Amazon vendors. But for a $100.00 for a Nitro Piston gun, it can't be beat. The only test left is the overall life expectancy? But these Nitro Piston guns are said to hold up longer than the spring guns.
In addition to a snare set for small game, consider for archery equipment, the Spectre take-down bow. Can't hurt to have one of these for the price of $80.00.
If you want to spend a little more, the Primal Gear Unlimited Take-Down bow is a nicer bow, but twice the cost.
As you've pointed out before James, crossbows are superior in that most folks can fire and hit with one accurately. I can at times, put a bolt within the same hole with my excalibur crossbow at 25 yards. The only problem is that they are not as easy to reproduce in a resource down situation, as would be a primitive bow and arrow set. But if one wishes to explore this option, there are several good videos on youtube illustrating homemade crossbows.
As much as I like the modern air guns and archery equipment, I still don't feel comfortable relying on anything that requires a modern infrastructure to maintain. The above mentioned products are a good start, but ultimately I feel that it's best to learn primitive trapping methods in addition to procuring your own low tech archery equipment.