don't quote me on this but a 9.3/375 ruger might have more capacity than the 9.3x64.
if so it would have some punch
the neckdown would be a fairly small one.
this looks like an interesting project.
another consideration might be a 338 win mag necked up to 9.3, and it would be a ballistic twin to the 9.3x64.
in fact almost the same case but with a belt.
there is one based on the 350 rem mag that is a waste of time due to retarded case capacity.
the ruger case necked down will require quality bullets, as many 9.3 bullets were set up for the velocities of the 9.3x62, and are insufficient even for the x64.
bruce.