Before I learned about alloys and the benefits of lower BHNs for most applications (certainly what I tend to shoot), I bought some commercial hard cast bullets. I have not used any of them and I am glad, since I likely would have had poor results and lots of leading. Since I have no intention of loading these things, it occurs to me that perhaps they could be used to harden up too-soft alloy in the casting pot. Anyone know what Berry's and others use in their hard cast alloys? I assume lots of antimony since that would be the most cost effective way to do it.