Twenty-four bullets per minute.
If I have enough furnace capacity to keep pouring (a 20 pound bottom pour furnace to cast from, and another acting as a melter) . . .
If the ingots don't run out . . .
If the wife, daughter and dogs don't interupt . . .
You will need to use BullPlate sprue plate lube at this speed, or you will get Lead smears on the top of the blocks and bottom of the Sprue Plate, as well as galling (an adhesive wear pattern) between the two.
Graphite spray mold release may be necessary with some molds to get the bullets to drop freely.
Material handling of the new bullets becomes a problem with air cooled (they ding each other) so I water drop into a 5 gallon bucket of water. They come out hard that way.
I use a bit of Tin in my Wheelweight scrap to make sure I get good fill-out.