My flinter friend and I have both let the black powder residue sit in barrels for a long period of time, in my case for over a year, as an experiement. After a few months it turns light grey. Neither he nor I had any rust or pitting of the bores. We both live in the same relatively dry climate but still an interesting outcome. We have an average of 21" of rain a year and are at 3700 feet of elevation.
I experimented on a cheap pre-war steel barrel Belgian gun, he on a reproduction flintlock.
Best,
Mike
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