The 9.3 x 65R Collath was one of the early cartridges developed by a well known German gunsmith around 1900 to 1906, I think. It shot a bullet of around 192 grains, I believe, but at what velocity? Was it a black powder or a nitro cartridge? Can anyone tell me anything about this cartridge, its velocity and bullet weights used in it?

sent Jack some data - not an easy calibre to find much about

I had a DR in that caliber, an L Christophe made in Belgium.

I know only one factory load.
The 195grs Tesco bullet and 2,5gramm Rottweil BP No.5. V25 was ~2000fps.

Martin