since you reload, what type of winchester powder are you using? 231 with moderate loads doesn't give me too much a problem with cast lead. maybe try Hodgden's new Titegroup or
Winchester's 452AA ( or its replacement). These might alleviate part of the problem. By nature, lead and its lubricants are dirty. Try changinbg your lubricant to one that has a higher temp than the conventional. Good Luck.
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