I noted what you have stated and given you status for doing so in my earlier post. So you say 1400 fps is your ceiling with a hard-cast bullet. I saw on a post that you can cast bullets out of zinc and that creates a HARD cast bullet. What would that make you think of?
I researched it but zinc, while very hard, is just 63% the weight of an equal amount of lead. And less weight means less momentum. That means no matter its attribute of no deformation at high velocities, I am not interested. Not to mention that zinc cannot be used in any other furnace crucible because it is not compatible with lead in the least. A .001 smaller zinc bullet than the size of the bore would sure clean the lead out of a gun barrel. Just shoot one or two shots out of your barrel and POOF the lead is all gone.