Hi Wayne. This example is a 12 ga. You gave me some good data above that I am looking at now. I really have not cast my own bullets before but am not adverse to doing so.... From previous research, I know that H&H and other paradox manufacturers made their own ammo for their own guns. Bore sizes were all different...somewhat of a shame as H&H has started selling ammo again that will work in their vintage guns as well as contemporary.
Per your comment on cordite...here is some data.
