Melted the monotype then recast 67 ingots (RCBS ingot mold) today, Learned a couple things.
First; Monotype does not cool as fast as lead. It looked solid, but when I dumped it out of the RCBS mold, the first ingots leaked and fell apart.
Second; the metals, tin-antimony-lead, seperate and absolutely requires fluxing.
Third; The ingots ring like aluminum, not lead, when dumped out of the mold.
I expect to mix this 1 to 20 for casting. It is really hard stuff.