Thank you, Gert.
I have that covered, however, and learned how to reload a few decades ago to feed the M1910. I had no source for proper 9.5X57 brass in those pre internet days but after much 'old school' research, and triple checking information, I resized fresh .35 Whelen. They formed with a single pass through RCBS dies, then were trimmed to length and filled with (then plentiful, now nearly extinct) Hornady 3715 (.375, 270 grain round nose) which made near perfect replicas of DWM531 and suited my purposes well.
DWM MS cartridges from 1939 Stoeger catalog
These days, in the U.S. at least, the situation is reversed. Accurately formed and properly headstamped brass is now plentiful (Quality Cartridge, Bertram) but round nosed 270 grain projectiles are hard to find. Fortunately, I had laid in a fairly good supply when I could and have also a healthy supply of the Qual - Cart brass.
The thread I had linked to previously (here 'tis again)
https://www.africahunting.com/threads/mannlicher-schönauer-prewar-m1900-m1903-m1905-m1908-m1910-m1924-m1925-or-high-velocity.47277/ contains an exchange between myself and HWL regarding the magazine rings and change of bolt release 'button', both of which were implemented with the M1924. There are also some MS magazine articles, catalog images, etc... .
My grandfather, John F. Easton (center), with M1910 Takedown Model. Photo taken 1932.
Here's a question for you, though. As I live in an area that now requires that lead free ammunition be used to shoot critters, do you know of anyone who uses a 'lead free' load in an M1910 (9.5X57) that cycles flawlessly, performs well, and could advise of what projectile they're feeding it?