I remember one of the first Civil War reenactment shoots I attended. I didn't know much about it then (you learn from experience thank goodness). I cast me some minie balls using wheel weight lead (all I had a the time). Not many of my shots hit the paper, and the ones that did went thru sideways. Yes, pure lead works much better.I would recommend saving your range lead for other bullets; keep the pure lead for the C&B revolver and muzzleloading rifles. Less stress and strain on your loading lever/ramrod, and better seal an obturation in the cylinder/bore. Others will say they have used it for this application, but if accuracy and consistence are your goals (I hope they are), keep with the softest lead you can find.