no,this are mostly double guns and some of them combinations guns and double guns also

here is another of the mysterious double guns with "Cal: d Schlusssp: 0.71"
serial number 5729
its clear that this is not for the 0,70" Randschlussspiegel cartridge I think it shoot a paper cartridge, the 0,71" Schlussspiegel" cartridge with some kind of wad in the end. this wad will be pressed against the breech when fired and obturate the barrel. when loading again this Schlusspiegel was removed with a hook by hand or with the next cartridge fired out of the barrel.

http://www.gunauction.com/search/displayitem.cfm?itemnum=7732807

tinker

and when you look at the tip of the forearm its different from the common gun and looks like having a hole. I am sure there was ramrod for this gun also not for loading the gun but for remove the paper cartridge if not fired after the hunt.

you can see the ramrod here in the illustration

anyway it shoots the same cartridge like number 7506 above