Way back some time, when Remington were starting in to making 700's for magnum cartridges, they believed that chrome moly barrels wouldn't last as long as stainless. Apparently they "iron oxided" stainless barrels and blued the iron oxide. Tried to reblue my original 7mm mag barrel, cleaned down the barrel, and then gunsmith told me after the bluing bath he was able to wipe the blueing off. Left the barrel clean and never had a problem.
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