Comments by "" (@neutronalchemist3241) on "Beretta Model 1923" video.
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The original Glisenti load was almost identical to the original 7.65 Parabellum load (since, like the 9mm Parabellum, it derived from that cartridge, but the designers of the MBT, differently from those of the DWM, didn't took advantage of the larger case to enhance the load), so, 1/4 less than the 9mm para load (literally, 3.3 grains Bullseye is a good 9mm glisenti load, and 4.4 grains Bullseye is a typical 9mm para load).
However, during WWI, 9mm Glisenti loads had been enhanced, since the cartridge was primarly used in the Villar Perosa SMG, and blowback SMGs are pretty strong actions. For example, USCco, during the war, made for the Italian Army a batch of 84 million Glisenti cartridges loaded with 4 grains bullseye, that's only 10% less than a typical 9mm para load.
Those "hot" cartridges were not especially marked, and were in the Army magazines, so, a 9mm Glisenti pistol made in the '20s had to be safe to shoot them too.
So, what happens if you tries to shoot a load that's 10% hotter than what the pistol is designed to handle? Nothing extraordinary. We are still in the safety margins of any pistol design. When the Beretta designers declared that the pistol could handle a 9mm para cartridge (obviously not +P or +P+, that didn't existed at that time), they were not mad or irresponsible. Simply YOU ARE PUTTING UNNECESSARY STRAIN IN AN ACTION THAT WAS DESIGNED FOR MILDER LOADS, and that is 90 years old too. In the long run, you'll almost surely have some damage in the action. Most likely in the slide. Moreover, if the recoil spring has weakened with time, you'll probably have some overpressure problem with the cases, and even some case head failure.
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