Is this a military round?
Considering the bullet type and the headstamp style, I
would think that this is a commercial hunting load.
Are you sure.
The round looks to me as an 9x57
To compare, a picture with a 7x57, 8x57 and a 9x57.
Thanks for catching my mistake.
If you are sure that it is 9mm then It is most likely to be the 9x56 Mannlicher-Schönauer as I have no record of Hirtenberger producing the 9x57 Mauser. They are very similar.
I actually measured the length seconds before jumping into my car on the way to work, and I saw it was not 57mm, but I blamed myself for seeing things and rushing. Thanks for catching mistake number 2. Any other oversights?