GO, it's just not hydroscopic. That's why bp stays viable, more or less, forever.

I sure wish you would post some detailed pictures of the gun. Must be a beauty. And it may be perfectly fine to shoot (or not).

If the barrel was loaded when it was clean, I would expect the chamber area to be in pretty good condition.

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BrentD, (Professor - just for Stan)
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[Linked Image from i.imgur.com]