I'd be careful using today's wheel weights.
Due to environmental concerns some of the weights I've seen lately are not made out of lead -- or at least the soft lead of years gone by. They seem to be some kind of alloy. Someone else might be able to provide more info.
Antimony (an-tim'-onee) is what has been typically used to harden soft lead bullets. Any of the guides for casting bullets should be able to give you the proper ratios for a desired hardness.
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BillCA in CA (Unfortunately)
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