Always check them

[BigMike]

Winchester white box, best I can figure I've had for over 10 years.

 

[wolfmanrogers]

Good advice, sir. The only problem I’ve had with factory ammo has been wwb.

 

[lostchild]

Years ago, I had two boxes of CCI .45 acp that I'd had for awhile. Stored with all my other ammo in a climate-controlled room.
Went to the range to shoot, every one of those 100 cartridges had dead primers. Not the first one would fire.
Never have bought another round of CCI centerfire ammo.