This was found in the cylinder of an antique Lefaucheux pinfire revolver. What is it ?
It has no base. I thought maybe it is a case separation failure, but the separation line looks straight and even, almost like it was made that way. Were any cases made from a separate base and tube ?
The pin hole is not fully open at the rear, so it is not a calibre reducing sleeve.
The length is greater than a normal 11/12mm pinfire revolver cartridge. Is it a carbine length case ?
Outside diameter = 11.9mm
Outside neck diameter = 11.5mm
Inside diameter at base = 10.6mm
Inside neck diameter = 10.4mm
Overall length = 22.8mm
diameter of pin hole = 2mm
Material appears to be brass.