Accurate Molds uses a CNC lathe for all of his molds.
He preps the blocks, makes his relief cuts, and pre-drills the pilot holes.
When an order comes in, he writes the code, clamps the blocks in a custom hydraulic chuck, loads the code in the machine, and lets 'er rip.
He has 2 tools for bullet molds, in his shop:
CNC mill (only uses a fly cutter and 2 other bits)
CNC lathe (only uses four cutting tools, two of which are for brass)
If you can prep your blocks on the lathe, you don't even need the mill.
"Such is the strange way that man works -- first he virtually destroys a species and then does everything in his power to restore it."