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MaduroBU wrote: ↑Thu Jan 14, 2021 4:16 pm I think humidity can affect them over time. When I open a can, I toss a silica gel packet in (maybe 2 of them if it's an 8 lb jug). I cannot prove that this makes any difference, but the theory is reasonable and the intervention is cheap.

In the mid 60's I was using some of my dad's paper shot shells from the 30's that had been stored in a basement in NY. They worked just fine. I am presently shooting .22 LR and .22 WMR purchased in the 60's. Much of the .22 LR was submerged in 5 feet of water during Allison. I stupidly threw away (Disposed of properly) several cans of IMR powders, Bullseye and Unique powder, including a 3lb sealed canister of Red Dot around the time of the Allison floods, also. No idea what I was thinking, but I'm sure they were still good.