moses,
The easiest way to get ammo is to load your own. The most used case is the 9.3x74R, shortened as appropriate and bullets to fit( usually either .358" or 9.3mm depending on particular version). I suggest you make, or have someone else make, a chamber cast and slug the barrel, to verify the chamber. If you just absolutely can't or won't load the ammo, there are custom loaders that can, but their services will be expensive and for the best results will need access to the rifle. An alternative is to prevail on a handloading friend for help. If you don't load your own ammo, you will miss out on 2/3 of the fun of owning and using these old guns.
Mike