Wheel weights are easy to sort. The lead ones melt first, the zinc ones are usually marked, but will float when the lead is melted, along with the clips. Steel ones are easy to spot, they won't melt at lead temps either, and they bounce. If you run the smelting pot at 600-650 you won't have an issue with zinc.
Babbit can be problematic, as who knows what else is in it, never know for sure if it is even suitable for bullets. Often a waste of time.
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