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If stored in a hermetically sealed container kept in cool, dry conditions, black powder will last forever. If it is possible to prevent the entry of moisture into its' container, Pyrodex might do the same. However, I have had Pyrodex in the original container, that was stored right next to cans of BP, start clumping and losing energy after a year or so. I thought the lids were all securely closed, but some moisture must have entered somehow!
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"It seems very difficult to impress most reloaders with the fact that every rifle is an individual, and what proves to be a maximum load in one may be quite mild in another, and vice versa." Bob Hagel, GAME LOADS AND "PRACTICAL BALLISTICS FOR THE AMERICAN HUNTER, 1977
The inmates are still running the asylum!
"If you are 20 years old and not a liberal, you have no heart. If you are 40 and not a conservative, you have no brain!" W. Churchill
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