Bullet Molds

[Frank Savage]

12L14 is fine in Ideal adjustable basepour, floating nosepunch configuration when looking up for right dia or shape for some oddbal or something "right on the edge", if you´re somehow underlathed. But it has to be held in circular clamp, since if done in the traditional "screw-in from the side" style, it wanders pretty much with the heat-no big matter if cold or hot rolled bar used. 0,002+ excentricity no problem, even not constant along the shank. Sometimes not, sometimes yes, depending on part of the bar used, temperature of the mold and alloy, moon phase and several other factors hard to determine. Fluxing and stirring by front left leg of a sacred roadkill does not help for consistency, as any other more scientific or shamanistic appoach.
For the final mold, cast iron or for smaller molds brass is the only solution. Don´t ask me how I know first hand.