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The copper plating isn't there to "help the barrel out".
The plating is there primarily to prevent rust of the steel bullet, and a lesser benefit, to help lubricate the cartridge during the feed cycle.
Pretty much the instant the fired bullet contacts the rifling and is engraved by it, the plating is gone from the contact areas.
With the plating gone, whether it's in contact with the case or not, given the right conditions of storage the mild steel will rust.
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