Thanks, Popper. I must've had a lot of sn in these old ww ingots, as most of the dross has been grey.
I cast a small bunch for testing. They are huge..3607" ww, .367 from this batch. Water dropped them, and 14 bhn shortly after casting. 31-32 bhn this morning. I'm thinking I messed up with the lee tester. Didn't have a big hammer, just a 20 oz one. Boolits flattened to .75" with multiple hits, no cracking at all.