re: Shelf life of ammo

He had half a brick of 22 LR for the Remington 22. Just worried since it is a rimfire. No 12 ga. All his guns were in the safe. His reloading stuff was in there as well. I would love to get into reloading brass but at the moment have no clue on it. He had a pretty nice collection. He used to re-blue,fix and replace stocks and do custom checker work. My wife and I found about 50 lbs of brass casings in boxes in the attic. My biggest question mark was the ammo. I just had no idea if it was still serviceable.

Oh yeah, checked the 22 when I pulled it out of the safe. 1 in the chamber with a full stick. Emptied the gun. It has been in there since 1993