Same length as .45-70 but the head diameter is smaller. Its been smashed flat.
Found this empty case west of Death Valley, California in a place called Saline Valley. Very hot place but lots of old mines. There's a name for this type of inserted primer pocket but I'm at a loss to remember what it is. I'd bet $$ its an American cartridge and not foreign.
case length: 2.1"
rim diameter: .525"
head diameter: .471"