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Using a good vegetable oil or fat, or an animal oil or fat based lubricant absorbs salts and forms a barrier between steel and any salt solution.
Yep, that's the theory anyway. In practice the barrels often rust under the lubricant. In the late 1950s through the late 1970s i owned a couple hundred different period muzzleloaders. The bores of the vast majority were trashed, some rusted under the tallow or lard.
A trash truck driver friend gave me three muzzleloaders found in a dumpster near Arlington, VA: One was made by Hacker Martin. The bores of two were filled completely with tallow, the other was filled with unsalted butter. Those bores were pristine.