Mixed up 200 lbs of alloy and sent a sample off to BNE for testing. The alloy is intended for softer plain based bullets under 1500 fps in my 25-20WCF, 38-55 and the 45 ACP. It came back at 0.7%Sn, 1.7%Sb. The Sb is just slightly higher than the common 50/50 + tin alloy so I'm not worried about that. I've never knowingly cast with such a low tin content. I'm pretty sure I can raise the heat level and make it work since it's higher than ww, but wondering how the malebility of the alloy will be effected. I seem to remember Ian saying something about Sb under 2% acting more like a Sn/Pb mix, but with the Sn/Sb matrix being a smaller percentage than the free Sb I'm wondering how it will react. Basically I'm thinking more about the 38-55 at 1400 as a hunting load, and whether the mushroom will hold togeather more than slough off. Any ideas? just getting too worried for nothing?