Ray B
AH legend
Looking through a John Donnelly book of cartridges I don't see anything that whoever modified the cases was trying to obtain- possibly a .45-100 Remington, but even that is only a slight resemblance. Possibly they could be pushed back out to fit a 470, but they would be a half inch short- so most probably wouldn't want to shoot them in a spendy double. but the box is worth using, also possible to rework the cases into snap caps.