Dilly541,
Not to worry, the terms lemon and Sauer don't usually go together( even though it is a 12 ga.). In case you didn't know, the 5.6X52R is the metric designation for 22 Savage HP. If you are a member of the German Gun Collectors Assn, you may find answers to your questions in old issues of WAIDMANNSHEIL or DER WAFFENSCHMIED(publications of GGCA),in articles by Axel Eichendorff or John Laborde. If you are not a member, I suggest you join.
Mike