While I agree that the .35 S&W was probably never loaded with a self lubricating bullet of the design under consideration here, it would have needed some means of lubrication, as the bearing surface of the bullet was all lead. The only purpose of the metal cap was to improve feeding from the magazine into the chamber of an autoloader. Lead bullets require lubrication regardless of whether they are loaded with black or smokeless powder to prevent leading in the barrel

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Tom
1560