I have Ammo from the 50's on up to fresh this year, I have not had a problem with any except the very odd x39 which will happen with fresh stuff. I do not and have not heard that well stored ammo will go bad or be inaccurate however a friend of a friend has ammo for his 300 wm and it is a couple years old, he is having issues hitting Moose and or not getting a solid kill,,( yea yea, I know) he thinks it is the rifle or ammo and to make things worse the sales guy at the local sporting goods store told him he needs new ammo and wants him to buy an $180. box of ammo. the friend wants to buy a new rifle. I believe his present rifle is a Remington 700 of some sort. New scope last year, doesn't clean his gun often if at all, sights it in like a lot of hunters, a couple shots,, maybe. So, I want to tell him that it is not the old ammo, he tried 3 different brands over the past few years. He also says the Rifle doesn't seem to have the power it used to. Any reasonable comments would be appreciated but most important, am I correct in saying that well stored ammo doesn't go bad after a few years or are there caveats to that statement? thanks in advance, Bob