I forgot to add the 16/65 stamp to the 1940 German lot of marks. The 9.3mm and 15.9mm stamps are for the final pass in 1912 and I'm fairly sure in the Austro-Hungarian proof facilities that for tubes with constriction(Nicht fr Kugel), like the Germans, the measurement would have been taken at 22cm. For cylinder bore it was taken at the muzzle. I guess a very tight 16 bore. On the reproof of the rifled tube, I would venture a guess that the chambering wasn't the normalized version so the chamber was altered a bit and then sent to experience Nitro proof. Doesn't seem to be any variation in the diameter.
Kind Regards,
Raimey
rse
