Updating my own post.
I obtained a sample of 9.5 mm, head stamped:
* D *
Mannl. Schoenauer 9,5 m/m
(The oe is really an o with an oomlaut.) I do not have any more information about the cartridge.
It is a round-nosed FMJ with a steel jacket...it is attracted to a magnet. The length is 2.8750 inch. The case itself is approximately 2.2435 inch. The bullet diameter is 0.3740 inch and the neck diameter is approximately 0.4045 inch. Of interest to me is its shoulder diameter of approximately 0.4445 inch.
The metric 9.5x57 cartridge drawing that I have shows the cartridge maximum shoulder to be 0.4488 inch with a minimum of 0.4409 inch (for safety). The chamber specification is 0.450 inch.
I note that the 375 H&H is shown with a shoulder diameter of 0.448 inch in most of my reloading manuals. The 8x57 is shown with 0.431 inch for the shoulder diameter.
It seems the easiest way to get brass is use 8x57 or 9.3x57 and neck up. I plan to seat bullets out to touch the lands for fire-forming. I note that the 375 Hawk-Scovill has a 0.454 inch shoulder. This leads me to believe that there should be adequate shoulder for head spacing after fire-forming unless that 0.004 difference is critical.
