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I assume you put a piece of lead alloy in the lower die then squish it into shape, right? I would also guess that the slug would have to be precisely the correct weight before swaging. A slug that was too small would not fill out and one too large would not compress fully, right? How are the preforms precisely sized before swaging? Thanks.
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The pieces of lead are usually cut from a coil of lead wire using a simple hole through which to push the lead wire, which contacts a "stop", and a leaver is pushed down to cut the core. The dies to swage the bullet has a "bleed" hole where the small amount of excess lead is forced out.