Okay, I've always been of the opinion that ammo stored "cool and dry" would last a long long time. A few hours ago, I decided to shoot my M&P 45C here at my home range with my CCW ammo. I switch between it and my 26 for CCW. Federal Hydo-Shock, 230 gr, probably 3+ years old. It's 8+1. First 3, boom. Next 3 FTF. Racked each out each time, waited a bit, and looked at them. Good primer strikes, same as the ones that fired. Next 3, all booms. Had 7 left in the box so I ran them and all but one fired. Refilled my carry mag with 6 month old Winchester PDX1 Defender. Ran 11 rds, no problem. I'm now a "BELIEVER". Better to learn here than somewhere ugly. Even at over a buck a shot, I'll be cycling it from now on. First shot.