I've shot old stuff(15-20 yrs old) against new stuff just bought from the store. If it is stored properly you visually can't tell the difference. Accuracy, no significant difference. If it is starting to corrode than it wasn't stored properly and all bets are off. Ammo 2-3 years old....unless it's stored in an environment with moisture it should be good. A lot od ammo sits on the store shelf that long in smaller stores.