Michael
you should still be able to get the RWS 293gn TUG's & 286gn solids for the 9.3x64mm.
https://rws-ammunition.com/en/products/centerfire-rifle-cartridges#filterForm
Just looked then - no solids available now!
The TUG is an old bullet design, designed by Herr Brenneke himself & still more than capable of doing plains game anywhere.
If you are able to reload then the brass is exceptionally good, being able to be reloaded many times.
Voere make great rifles - lovely pick up mate!