Voere 2165 with Mauser 98 action is available in 9.3x64.
Rim diameter is .496, smaller than standard magnum but larger than .470 standard Mauser bolt face.
On top of previously mentioned mods you will need two cross bolts, a barrel mounted recoil lug and a recoil pad.

http://www.voere.com/en/waffentechnik/jagdwaffen/repetierer-2155.html#specification-2165