A good way to avoid corrosion is to use nickle plated ammo in your carry weapon/holster/mags - thats why they came up with it in the first place. It was brought out to combat corrosion by ammo left in leather belt loops for long periods of time.
When you manually load a round then close the slide the extractor has to travel over the rim of the cartridge, rather than it already being in front of the rim as when a round is loaded from a mag. It's the popping over the cartridge rim that can damage the extractor.
On a related issue, what are you supposed to do with the dead deer in such an incident?
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