I noticed that no one has evidently responded to your question about 8X65RS ammunition. I have recently had a Krieghoff drilling in caliber 16/16/7X65R rebored to 8mm and rechambered to 8X65RS. Although I have had the opportunity to test fire the gun with the gunsmith, I still have not received it from Germany, but I am looking forward to testing it in the hunting field soon. I intend to load my own ammunition, using cases formed from 7X65R brass, which may end up being a millimeter short after expanding, but otherwise of no consequence.

Actually, you could use the same brass to form a sort of rimmed .35 Whelen, which would give you a choice of a number of excellant bullets. You could use conventional .35 Whelen reloading dies and the gunsmith could use a conventional .35 Whelen chambering reamer. The only additional procedure involved would be to cut a recess for the rim in the breech end of the barrel. I have a Winchester single shot rifle which I had barrelled many years ago to a rimmed version of the .250-3000 Savage cartridge, using 8X57RS brass as the basis for the case. It functions flawlessly, as might be expected.