...I've used the Dixie Mould to make cartridges for my Pa's vintage 1863 Sharps Carbine. Works well.
I saw some adjustable molds listed in Midway's catalog. (.500, .520 & .540 diameter, RCBS Adjustable mold, pg. 454)
Read an earlier coment on the negative aspects of a hollow-based bullet.
I do wonder how a HB design would be harmful in this weapon vs. a conventional cartridge or other firearm (??).
BTW, the proper way to load/shoot the 1863 Sharps Carbine is to use a paper or linen cartridge. The cartridge should fit in the chamber and close without cutting the base. The fire from the cap will burn through the base and ignite the charge. A cartridge can be removed (unload) from the rear if needed/desired. Too bad we can't get Lawrence Patent primer discs & demonstrate how this Carbine really worked.
Regards,
Slim