I've pretty much dropped out of this discussion, but did look up some lead alloy information, links attached:

Fishing lure, and tire lead talk: (alloys less dense than pure lead, usually)
https://www.tidalfish.com/threads/lead-for-pouring-jigs.279917/

Monotype lead, also links to Linotype lead, (whatever those terms mean):
https://www.matweb.com/search/datasheet.aspx?matguid=63031aa385cc4b72b103fa2dc9320ca8&ckck=1

- Brian