Even wet it's fine just dry it out. I read the journal of a CSA Ensign who wrote about drying out powder on sails stretched on the deck.I have read that a court house in South Missouri was torn down and they found cannon balls that were fired during the Civil War that were still active and found that the powder was still usable. They even called in the bomb squad. As long as the powder has not been wet it should still be usable.
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