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Whether ammo will go bad or not depends heavily on how it's stored. In humid weather, it won't last as long as in a dry climate.
As someone above said, storing it in or near an oily cloth will kill it too.
I have a bag of mixed .22 stuff that I've aquired over a number of years. Some of it is from the early 1980's. A year or so back, I decided to use it up before I use any other ammo, and it's now almost gone. Misfires have been rare, but I live in a relatively dry area (Arizona).
I'd suggest buying a box of new ammo, and try it out. That'll tell you for sure if it's the gun or the ammo.
Daryl
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