Hello, Ibgreen:
Apologies in advance for jumping into the Thread.
I am testing a Ballisti-Cast custom 315gr - 325gr, two cavity bullet mold for my ROMANO Spencers with 34" twist and a .510" bore using 14Bhn alloy. They are copying Larry's proven design which he is not presently set up to produce. B' Cast's two-cavity blocks are set with a sprue plate separation that matches their auto casting machines. This separation dimension creates about a 1/8" cavity wall separation between this large a cavity, which seems too narrow for consistent casting at 735 degrees and bullet drop.
So, how does the four cavity mold you pictured perform, please, and if ok, what might you be doing that prevents bullet drop hang-ups?
Many thanks,
Kevin