I believe that the background of xausa´s initial question is the statement of Dorleac somewhere on this forum. He wrote that Mauser used to take only large ring/small shank actions when dovetailing the front receiver ring for a scope mount. I appreciate very much Dorleac´s deep knowledge of Mauser actions and rifles , but in that case I have to disagree. It would imply that the engeneers at Oberndorf mistrusted the stability of the action after slotting the front ring in case of the large ring/standard shank. #1.
They didn´t hesitate to cut the receiver ring on the Kurz Mausers single square bridge when they applied scopes with the original Mauser mount. Wall thickness in case of large ring / small shank .155 .Smallring/small shank (Kurz action): .160 . Not a real difference.
#2. I have encountered a couple of single square bridge actions ,large ring standard shank with the original 3 foot Mauser mount and front base dovetailed into the receiver ring.
#3. It is nearly impossible to determine in the case of a Suhl type mounting if it was done in the Oberndorf plant or aftermarket by a gunsmith elsewhere. #4. As a rule of thumb I would say that a Suhl type mount done at the factory is an exception and the action type (small or large barrel shank) is in no way a sign of the origin.
#5. After nearly over 40 years in dealing with Commercial Oberndorf rifles I have learned to avoid the terms "always" and "never"