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I just picked up a German O/U Cape gun in 16 ga. and what is marked on the rifle barrel as a 7.8/78mm. I did a chamber cast and it is a 78mm long slender, tapered cartridge. I cannot find out much about it. I'll try to post pictures later. Anyone ever run into such a cartridge?
By any chance does the back end of the chamber have the same dimensions as a 9.3x74R? If so and you were to full length size 9.3x74R brass you would pick up a little length.
The rim dimension on my barrel is .517. I'm not following. I understand the lengthening. How would that reduce the neck down to 7.8mm? I have no idea what dies to get for it.
Try Huntington Die Specialties or a die set, no doubt it'll be a special order item but they'll make most anything.
Measuring a RWS 9.3 case I'm getting a 0.522" rim and 0.463" on the body ahead of the rim.
Sounds like the bore would take the .318 dia J bore 8mm bullet. the case length sounds like its gonna be problem....
Yes, .318 would be right for the bore.
The best Quickload would do is 8x75R
The creator is german so if they existed he'd include them.
https://imgur.com/a/JlXJUGF
I know that the 8,15x46R cartrigde has a way long leade and maybe this one has one too, and that might fool you?
These old BP cartridges has typically a very roomy threoat/leade to accomodate for BP fouling.