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kens;n13507 wrote: I like to know why lead doesn’t stick to a iron mold just like solder?

Because solder has lead only as an additive, with tin being the part that marries the steel. Most solder is at least 50% tin, while most bullets have less than 5% tin, and lead has little affinity for steel, iron, brass, or aluminum.
It CAN stick, but only if you produce a “scrubbing/smearing/rubbing” action such as what happens under the sprue plate. To eliminate that, use a sprue plate lube.

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