I've got quite a bit of range scrap lead, a hodge podge of melted down FMJ pistol bullets, 22's, old round balls, etc. Using sketch pencils to test the hardness of the ingots , it appears to be around 7-9 BHN or basically 40:1 or 25:1 lead/tin. Can this be used to cast round balls or conicals ( Lee R.E.A.L. bullets) ? When casting muzzleloader bullets is it a hard rule of "100% lead or nothing" or is there some wiggle room ? -Thanks