There were huge numbers of Remington Rolling Block rifles made for many governments. Even the U.S. Navy used one briefly, in .50-70. I fired one of those once. There were also RB copies made, I think in Belgium, maybe other places also. The .43 Spanish and the .43 Egyptian cartridges are very similar but I believe there are some small dimensional differences. Many were made in 7x57 Mauser for use in South America and Mexico. One of the most interesting (and rare) versions is the Papal Remington Rolling Block, carried by the Swiss Guards in the Vatican. I don't remember the caliber, but I think it was a short straight cased .50 Caliber (I looked it up - The 12.8x45R Papal Remington, used from 1870 until at least the late 1880s). I remember reading about attempts made to blow up the rolling block action by firing multiple charges of powder behind multiple bullets. Nothing happened except the noise of firing.