I found it has about 2-3% antimony. I melt in linotype and calc. using 2%. And of course tin either in ingots or 50/50 bar solder.

There is a fantastic casting calc. on cast boolits website. I get BHN of around 14 using 2% as a baseline in wheelwieghts.

Last melt, I made up about 200lbs of Lyman #2, with 70% WW, 10% 40/60 Tin/Solder Bar, and 20% of Linotype.