How long does ammo last?

[SeattleVet]

2. Most likely fine.

A couple of years ago I fired off a bunch of .30-06and 12Ga that my father had from many years ago. The last time he had been hunting was in 1963, so it was all at least 50 years old, and just stored in a range bag in the closet. Every round fired properly. I also used up some .30-30 that I had bought in 1975 or so.

I had more problems with some brand new Remington .22LR - at least 10 misfires out of the 500 round box. (All of those finally fired when I ran them through the rifle a second time, making sure that the firing pin hit a different section of the rim.)