The booklet says, "The device is not designed to shoot with military cartridges."
It shot a proprietary 11.15x37.5R cartridge, a trimmed down version of the military cartridge.
Some large rimless magnum or military cartridges have a belt formed above the extractor groove.
As any widely used military cartridge is guaranteed to be a success on the commercial market, the .223 Rem.
First, the 20mm is a military cartridge over a half inch diameter.
The 9.3x62mm was never a military cartridge and so never had this problem.
As the French public could not use military cartridges, it was made possible in this case by reducing the caliber to 7mm, keeping the rest the same.
The Modelo 1913 was a delayed blowback design, unusual in a gun chambered for a powerful military cartridge.
It was subsequently adopted by several other countries as the standard military cartridge.
In its day, the 7.92x57mm Mauser cartridge was one of the world's most popular military cartridges.