Theoretical BB Manufacturing...

I have been working on a few different ideas about gun design etc. and have gone back to the drawing board with the actual design of the BB. One thought that occurred to me was the method by which shot is made for shotgun shells (here is an article):
http://en.wikipedia.org/wiki/Shot_tower

Basically molten lead is dripped through a tower, where the aerodynamics of falling creates a sphere and hardens on the way down. Once at the bottom it is rapidly cooled by hitting a body of water.