The Remingtons, I don't know. But when I lived in Egypt in the mid-'50s, the Camel Corps carried Martini-Henries. My dad was in oil exploration, and we were often treated to a trip out to camp in the desert.
One time a Camel Corps patrol came into camp, and we gave them coffee, bread, tobacco, etc. My dad (who was a trouble-maker at heart) made disparaging remarks about the Martini-Henries (which were in NRA Junkyard Condition) and finally bet one of the Egyptians a pound that his Martini-Henry wouldn't fire. The Egyptian took the bet, but said Dad would also have to pay for the ammo.
Then he gathered up twigs and grass and used them to wedge the cartridge into the chamber and fired it -- but I noticed he held it out at arm's length to do it.