That is indeed an interesting gun. What is the firing mechanism?
: The only pin-fire rounds I have held, had no rim at all, with a radiused edge to the brass base as well as copper cased .32 cal. handgun pinfire rounds also - no rims. The only exraction possible was by the pin. Seems to me, there was a pin-fire that was about 3/8" ahead of the ctg. base.