The kind of stuff you find in grandpa's attic here in Switzerland
With the semi auto successor also from the attic (Waffenfabrik Bern Parabellum 06/24 in .30 Luger / 7.65 mm Parabellum)
The 10.4 mm Swiss is a metallic centerfire cartridge, with a heeled bullet (like .22 lr), which means that the bullet is the same diameter as the case, and has a narrower "heel" portion that fits in the case.
From Wikipedia
10.4mm Swiss Centerfire - Wikipedia, the free encyclopedia
With the semi auto successor also from the attic (Waffenfabrik Bern Parabellum 06/24 in .30 Luger / 7.65 mm Parabellum)
The 10.4 mm Swiss is a metallic centerfire cartridge, with a heeled bullet (like .22 lr), which means that the bullet is the same diameter as the case, and has a narrower "heel" portion that fits in the case.
From Wikipedia
10.4mm Swiss Centerfire - Wikipedia, the free encyclopedia