A question about the identification of a gun and associated cartridge shown in a short WW1 (circa 1917) French movie (video) of a weapons test/demonstration; shown at the 2 minute mark in the movie: cnc-aff.fr/internet_cnc/Inte … 43850.html
Here is an image captured from the movie, it shows individual cartridges being loaded by hand for single shot firing of the gun-
Is this French?
A precursor for the 13mm Hotchkiss?
Any info, guesses are welcomed!