The other day I shot some 9mm stuff that was something like 25 to 30 years old, depending on the cartridges. They were within that range
. A coworker gave it to me. They know I like shooting and sometimes they give that "spare" ammo they have in their lockers and that they won't shoot. Thanks, guys.
Absolutely no problem. It all cycled, fired and ejected fine. They had been stored in lockers for all that time, so I guess they were close to proper storage conditions.