I did a recon mission into the deep part of my reloading bench and discovered a couple of bricks of shotgun primers. Some go back to 1975 when I bought them. Some Rem 157's and older CCI's and even some Winchester and Federal. The real kicker was 3 sleeves of Alcan 220's. I haven't loaded for shotgun in over 30 years. I'll bet they are as good as when I bought them.