Sorry, I do not know the Brinell hardness number or the alloy mix. All I know is that Arnie (the guy doing the casting) knew his business, as my friend has never had leading of any significance.Thanks all for chiming in. Ordered myself the LEE 440 gr mold, some gas checks and the Lyman sizer for the 450... Never saw the Hodgdon lead data on their site - was probably too focused on the FMJ.
What kind of hardness do you use for your .500 bullets?