I acquired a used mould that appears to be warped when looking through the cavity towards the nose with the blocks held together. It has the letter "J" stamped on the short side of the block towards the handle, is iron, and appears to be a copy of the 40-400 BPS RCBS bullet. After casting with it, it leaves fins on each side of the bullet which I remove with my fingernail or dull knife blade. Although it shoots well in my .40-60 Maynard 1875 Sharps, it is a real pain to scrape 120 bullets before running through the sizer. Can this mould be resurrected? If so, how? Thank you.