Most double rifles in 9.3 I've seen are 9.3x74, a VERY long rimmed round. Sounds neat! I got to closely inspect a .470 Nitro Krieghoff used in the 'Under Wild Skys' shows on ESPN, some of my "outlaws" run the production Co. here in Tulsa. "Was that an elephant I heard?"

It appears Collectors Firearms may have a problem with "attention to detail", they even had the serial # recorded wrong in their books on the rusty rifle mentioned above, fortunately my FFL dealer called them right away to straighten that out.