I had issues with leading, and listened to others advice of "fit". Slug you barrel and check your cylinders (make sure you cylinders aren't resizing/shrinking/swaying your bullets to too small). I've found that hardness is only part o the equation, and a smaller one than size/fit when it comes to leading. You'll get better accuracy, too!!
Another option is powder coated bullets. They're pretty cheap, too.
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