You need a shotgun that can handle the big 9.3, something like a mid 1970s Simson/Merkel. I do have the Simson in 12ga, if you're serious about doing this.
It's built on the heavier Simson/Merkel reveiver, not the one that they got from Sauer to build some doubles.
I also have for sale right now a Simson Mdl 90 drilling in double 12 and 7X65R that would take a 9.3X74R full length insert. I have a 22 Hornet for it, also. It's topped with a 1.5-6X Hensoldt in swing mounts.
It would make you a hunt Anything gun with the addition of a 9.3X74R insert.