Just a note, there were four different rounds called the 43 Spanish. A carbine round that was shorter. Guns for this are rare but surface occasionally. I had one which I sold to a guy at a Richmond gun show 30 yrs ago. There is the 43 Reformado, which is not even a 43 cal but a strange bell shaped case with a 454 bullet. Also used a brass jacketed bullet. Then there is a 43 Spanish that takes a 433 bullet. (Some sources say it is the same as the Peabody 433, but I think that is some confusion. I read that some NY and New England militias used a 433, but again whether it was 433 Peabody or the 433 Spanish, I can't say.) Lastly there is the most common 43 Spanish, which has a takes a 439 bullet. This is the most commonly encountered of the 43 Spanish cartridges and rifles. The metric designations are:
11x46R (433 Carbine)
11x58R (433 full length 43 Spanish)
11.15 x 58R (439 bullet 43 Spanish) most common
11.5 x 57R (Reformado) Sort of a bottleneck with no neck
they all can be made from 43 Spanish basic brass.
The Spanish also made rolling blocks under license from Remington at their Oviedo arsenal.