Actually, I have 2 boxes of loaded 9.5X57 coming to me from Reeds Ammunition and Research (Oklahoma, U.S.) that are made from 9.3X57. Should arrive tomorrow. He gets fresh Norma brass that, although headstamped 9.3X57, is straight walled when he receives it. He then forms to 9.5X57.

The only brass I have worked myself for the M1910 was .35 Whelen which formed easily with a single pass in RCBS dies (after cutting brass to approximate length, finish trim after sizing). With the .35 Whelen the shoulder is pushed down from its original location giving a good solid shoulder. Many people have used .30-'06, but it must be worked in steps, I'm told.

I've noticed ads for the Bertram. Pricey stuff. I was about to buy some when I saw the Qual-Cart and figured I'd give them a try. looks nice, haven't loaded it yet.

There are several posts on the 'net from people who say they simply fireform ( )X57 brass, then load for their 9.5X57. Others say this is a very bad idea, as the brass is likely weakened at critical points during the stretch.

Note the shoulder of 9.3X57 has a width of .433 and is 1.805 from the base (in inches).
The 9.5X57 (Eley drawing) shows a shoulder of .455 at 1.825 from the base. I have some original DWM 531 of 1926 manufacture that measures .453 at the shoulder.

The 8X57 Mauser is narrower still, but not as low.

I had once ordered some '9.5X57' from another loader that had been made with 8X57 and sent it back.

They had apparently not been 'drawn out', the shoulders had not been touched by the sizing die and were low and narrow.

9.5X57 Mannlicher Schoenauer - .375 Nitro Express Rimless 2.25"

Perhaps I should have worried about the shoulder width of .35 Whelen, but those have all been fired by now (leaving a nice fireformed shoulder) except for one I kept as an example. The shoulder of brass that has been fired in my M1910 measures .459+ on my dial caliper.