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In the Lee Moderen reloading second edition on page 52 Richards writes this" Carbide dies usually eliminate the need to lubricate the cases. There are exceptions. If cases are excessively clean, some of the brass will rub off on the carbide. The dirt, soot, oxides and oil on the case keeps the case from galling the carbide. None of the foreign matter on the brass case is hard enough to damage your die. If you clean your brass in a vibrator with fresh media, you may need a slight amount of lube. You can even use a light spray of furniture polish. Lubricating your cases with the lee sizing lube as it comes from the tube is gross over kill. Dilute it with 10 parts water or even better use rubbing alcohol."
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