If 15625 were originally an 8 bore pin-fire, and it sure looks like it was, then it likely was originally chambered for 3.25" 8-bore pin-fire shells (unless someone in the 1860's was making longer shells before Kynoch came along - which is also possible; Reilly at the time was making his own shells). Kynoch center-fire 8 bore shells were the same length as the pin-fire. Thus when converted from pin-fire to center-fire, no need for reproof?

It now has 4" chambers. Anyway, learning a lot...always a pleasure.

Baluch are not Brahui, Brahui are Baluch