That late WWII-to-post WWII Winchester 9mm Parabellum ammunition is labeled "For use in submachine guns" not because it is of higher pressure and velocity to be dangerous if used in pistols, but is so labeled because earlier loadings were not reliable when used in sub-guns. It's velocity and pressure is perfectly safe if used in handguns such as the Browning High Power or the Parabellum.

This question has been adressed many times in questions to the American Rifleman Magazine technical editor.