I've been casting straight COWW's for a while (I have 1,000-1,500 lbs stashed) and have been considering spicing the mixture for my rifles (mostly 30 cal but with some 35 and 458 thrown in).
I've been playing with the Lead Alloy Calculator from this site and hit on this combination.
500lbs COWW's
5lbs Tin (Rotometals. 5 x $15.99 = $79.95
5lbs Grade 1 Babbit Alloy ( Rotometals 5 x $19.99 = $99.95)
For just shy of $180 (I've already got the COWW's so there cost does not enter into this (about $20 a hundred average) I would get 510lbs of alloy with a mixture of
Tin 2.36% Antimony 2.99% Arsenic 0.25% Copper 0.04% Silver 0.00% Lead 94.4% Est. Hardness 12.0
I'm thinking that would cast well, harden well (water drop or oven treatment) and be useful for both hunting and target shooting.
I know some on this list have been experimenting with adding copper to their alloy. Is .04% enough to be useful, negligible or a problem?
Thanks