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That bit about the water is interesting. I suspect it would in reality be uncontrolled humidity. I say that because it has been reported that Alliant has a 100+ year old sample of Unique that is stored IN water, as in, the powder itself is wet, underwater. They take some out periodically, dry it out and test it. Word is that it still works just fine
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I have not only heard this, but I talked with Hercules in the 90's. The rep told me that the powder was discontinued. Might have been Sharpshooter or Lighting?
The expert said water is ionic and damages the surface of powder grains. He said shelf life is reduced after exposure to water.
Gunpowder is a very complex chemical. Rust, water, ionic compounds interact with the chemical bonds and pull nitro to the surface.