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Paul,
Years ago I became friends with Carlton Shy, the cast bullet editor for the IHMSA News at the time. Carlton was and engineer and did extensive reserch into various loads and bullets used in cast bullet / cartridge making. Carlton developed a formula that is very good for an alloy. I have used the formula for 20+ years.
It is:
6 Parts clean wheelweights
3 parts lynotype
1 part chilled lead shot (arsnic)
The alloy casts similar to what you are using with heat treating it reaches 34-37 B and with a gascheck and a good lube like LBT Blue will reach 2,800 fps without leading. It water drops to 22 B. The most important attribute of the formula is it is very consistant in weight and fills a cavity full, with square edges on every pour. Thus you have good consistant match quality bullets.
Carlton wrote a book, now out of print, that explains a lot of what he did. He also created a computer program named Compubal. The book is excellent and the computer program I have used to design cartridges.
Ed
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