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Why was this stuff even invented and is there a 'modern' way to clean fouling from brass cases?
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BP is classified as an explosive. Pyrodex is classified as a propellant. Pyrodex is basically bp made with potassium perchlorate instead of potassium nitrate. It's good stuff. The best way to clean fired cases is as soon as you fire them drop them in a jug of Windex without ammonia. When you take them out of the Windex tumble them. They may not come out sparkly clean but they won't have the black discoloration.