Proofed in the final state in Zella Mehlis in September(not August) 1918. Any pics of tubes? 8.8m/m is the pre-rifled tube diameter. Have you tried to chamber a 9mm Flobert? NGP M71 is Neues Gewehr Pulver(black) for the Model 71 rifle. This type proof was used on muzzleloaders yor weapons requiring a designed load.


Kind Regards,

Raimey