Since I have no access to lead alloy, COWW or otherwise, I buy certified alloy from foundries. I agree with the posts that time involved makes it a no-go. With the Zinc percentage going up, and continuing to go up, not worth my time. I would rather be picking up aluminum cans on the side of the road and sponging for rum. If I come across something at a scrap yard at a fair price I will smelt it. Otherwise, the certified foundry ingots go right into the Pro Melt.