Culpeper wrote on Nov 28^th, 2017 at 1:14pm:

Copper enriched?  Is that like a kind of babbitt alloy?

Easiest way is adding number 11 Babbitt alloy to your lead alloy to get to 2-3% tin and antimony, and .1 to .2% copper.  It doesn't take much copper to get the benefits.  VERY tough alloy.  As I remember (it's been awhile since I smelted a batch), I believe I added one (approx. 2lb.) ingot to 48lb.s of 50/50 wheel weights and range scrap.

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One thing to note is that when casting using copper enriched, your pot temp will have to a bit higher to get good fill out.