Are clip-on wheel weights made out of different metals than they used to be? The last time I bought wheel weights they came from a tire shop back before mag wheels became popular in the early 1990's. And the gas checked boolits I have been casting with them all these years worked pretty well for me. Unfortunately I ran out of them (wheel weight metal) recently as I have taken back up shooting cast lead boolits again after several years of non shooting. And my wife's brother gave me about 100 pounds of wheel weights that he had taken off police car wheels when he was a mechanic for a police agency in a big, mid-west city. And these wheel weights look different and seem to be lighter than the lead ones I used in the past. Now I am trying to melt some of them down. What can I expect to see and how do I seperate the junk from the lead?