OK, I got my lead supplies tested and have basically 4 groups of lead and I need to calculate how much of each group I will need to mix to get to a specific alloy. I have one batch that I call lino that is 75.5% lead, 18.8% tin and 7.7% antimony; another batch that is 99.5% Pb, .1% Sb and 0% Sn: another batch that is 95.9 Pb, 3% Sb and 1.1% Sn and finally a batch that is 99.7% Pb, 0.2% Sb and 0.1% Sn. I also have a quantity of SOWW that I did not have tested as I believe these to be 99.5% Pb.
Now the questions! How do I mix these different batches to arrive at Lyman #2 or 20:1 or any other recommended mixture. I have a fairly large pot that I can get more than 20 lbs into. I can add a material from different batches a pound at the time. I don't know where to begin with this process.
I have worked with this in a spreadsheet and can get fairly close but can't seem to get precise in my mixtures. How close is close enough?