[M1903A1]

Everyone knows you can't get two magazines through one of these without it jamming.
Sad state for such a pretty pistol.

The trick is to use proper European-spec ammo, which is a fairly hot load. Most American-made (or SAAMI-spec) 9mm Luger is loaded to lower pressure standards for safety reasons. (As I recall, it's because there's a Spanish cartridge of identical dimensions but loaded to lower pressure specs.) Sellier & Bellot works well in Lugers from what I've seen.

[donmeaker]

Exactly. European loads are light for caliber high velocity sub-machine gun rounds that can also be applied to pistols.

Most Americans have the peculiar notion that a pistol should hit that at which you aim, penetrate to it’s vitals, and stop what ever nonsense gave you cause to shoot, and then let you get ready for what happens next. That leads to heavier bullets launched at lower speeds.

Good work can be done by both concepts. Napoleon, recognizing that more men are scared off than killed off said “The Morale is the the Materiel as three is to one.”

[RitchieAprile]

Spanish Largo is 9x23, Parabellum is 9x19.