Collath guns are known to last and last. I might wish I could find one in my rather limited price range. Good luck and enjoy!Contact www.doublegunshop and go to the German/Austrian section of the blogs. Establish a thread there or ask questions. If you can, PM either Ellenbr or DerAmi and they should know where to send you. You may have to sigh up. If I find anything, I will post a response, as well. It would be easier (?) to find in Europe, but we aren't there....
If I were you and I found any, I would probably massively stock up! Collath was the world's worst at providing their own ammunition/sizes before standardization.
AND, due to his unique lock up system, there probably wasn't an off face gun in the bunch!Dumb question, but is 7x65R the parent for the 9.3x65R collath? If so, you might be able to size up and anneal in many steps to convert brass. I'd do some googling to see if there is a way to form brass from another caliber.
Collath was a brilliant guy. In addition to all his cartridges, he is famous for two things we see often: 1.) The collath forend release that is the big lever often seen on Germanic guns, 2.) He invented the gas-check bullet.
All the Collaths I have seen were mid-grade to best guns. Not a junker in the bunch.