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While smokeless powder is not hygroscopic, it will absorb moisture and come to equilibrium with the water vapor it is exposed to.
This WILL alter the density and weight of the powder, throwing even weighed loads off.
Powder is routinely stored under water for long term storage.
Radford Army Ammunition plant still had concrete pools filled with WWII cannon powder in the early 1980s.
It was being reprocessed to extract the nitrocellulose and then used to make rocket engines and newer powder with a higher nitrocellulose concentration.
The old stuff was only in the 50-60-70% range.
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