And the one pic that could determine it is missing ;-)
The muzzle!
Take the dummy and see if the front part of it will fit the muzzle.
If it is indeed 7,65/.30 only the tip will enter, if it is 9mm most/all of the front part will enter.
The 9mm has a stepped chamber and the dummy might be binding in that part so it looks like it is a 7,65/.30 chamber.
That or use a dial caliber. The difference between .308 and .355 is obvious.
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