I guess it would have been better if I had checked your other posting first before asking the above questions. Now that I have seen the chamber casting, I believe your rifle is chambered for 14.2x33R Wanzl Scheibengewer, which is the centerfire version of the 1867 14mm Wanzl Rimfire (see municion.org.). This cartridge is also found in European Sporting Cartridges by Brad Dixon. It is shown as 14.2x33R Target on page 147 and 148 under his number A71. Confusion always enters discussions on identification of nominal cartridges for rifles
that are not so marked. A chambercast is the only way to identify chamber dimensions, but they are always larger than cartridge dimensions. Likewise, the actual bullet diameter of the nominal cartridge is smaller than groove diameter of the Black powder rifle it is intended for and often smaller than actual bore diameter. Current protocols are different of course. The nominal cartridge must have been available when the gun was made and likely would have been in common use at the time (maybe only locally). The above-named cartridge meets the considerations.
Mike
