I have a chance to purchase a decent box lock pre war Krieghoff drilling. Date of manufacture is 1931. It is SXS 16 guage with the rifle caliber advertised as 25-35 WCF. The rifled barrel is marked 6.3mm over 58 1/2. Does anyone know what the rifle caliber really is? Thanks in advance.

Last edited by Jared1; 01/05/13 05:54 PM.