and unofficially also known as the 9 × 25 Super Auto Grillmeyer, is an Austrian pistol cartridge.
The 10mm Auto cartridge case was used for this since it has the capability to operate with relative high chamber pressures for its case capacity which, combined with smaller and hence lighter bullets result in very high muzzle velocities.
(Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) certified in 1991.
It might however still used by a few shooters who produce the cases from 10mm Auto brass by reshaping the shoulder and neck, and handloading it with 9 mm calibre bullets.
(Commission Internationale Permanente Pour L'Epreuve Des Armes A Feu Portative) guidelines the 9×25mm Super Auto G case can handle up to 255 MPa (36,985 psi) piezo pressure.