I have a Spanish Reformado and had a Spanish Remington. They are two different cartridges using two different diameter bullets but can use the same brass.
I used the now defunct Bell Brass Basic brass. It comes around 3" and needs trimmed to 57 or 58 mm (that is 2 1/4") My first batch, I used a pipe cutter, and it was "acceptable". Now I have a Forrester "Classic" case trimmer, so my newer brass is more consistent. Loading dies are very expensive! You can just "Stuff and press" blackpowder loads a few time times until you get dies. The most affordable current production Dies are from CH4D in Mt. Vernon, Ohio (not far from my home). You will want to order the shell holder at the same time. There are no interchangeable bullets with American rounds for 43 Spanish, so plan on buying bullets or a bullet mold and sizer! (385 or 400 grain semi RN, Pure Lead only!) Usually the military ammo didn't fill the case with black powder, so felt wads were used to fill the neck to the base of the bullet. Oxbow wads in 45 cal. work fine! I used 75 grains (by volume) of Goex FFg on both cartridges, filled the neck with wads or cream of wheat and seated bullets to factory length! I always use a heavy crimp!
Some guns have had a 348 Winchester ream run in the chamber so you can use that brass. They require sizing in a 348 die, an absolute pain in the rear!
Ivan
