I have some unknown alloy which test 15 BHN. I mixed it 50-50 with pure, 10 pounds of each. Harles came by & left me an NOE 45-255-FN four cavity mould. I cast with it side by side with the four cavity Accurate 45-200E. The 45-255 bullets were .455" & 258.5 grains. The Accurate were .455 also & 205 grain.