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The 9mm has a relatively small case capacity. When you start to hit the edge of that capacity, you wind up seating the bullet into the powder occasionally, creating a "compressed load." When this happens, pressures spike straght up, which is bad. Variations in case thickness, cleanliness of the interior of the brass, and powder settling mean that it gets hard to predict which ones will compress. Because of the volume of pistol reloading, adding powder is usually done automatically, and might be as much as .2 grains high for most handloaders, or even worse if the measure gets really wacky or is at a factory. All of this happening at once in an already insanely hot load will lead to a very unpleasant experience. The volume of pistol reloading means that all of that will happen at once, sooner or later, and you'll wish it hadn't. If you're lucky, it's usually easy to tell after the fact, since your wrist now hurts, the case on the ground has a blown primer, that bullet was the flyer, and it probably separated upon impact. If you're not lucky, your autopsy will explain everything.
And then there's barrel wear. Not to mention that this will beat up your action.
In a nutshell, the answer to your question is: Living on the edge means you get cut every so often. Never gamble with explosives, and never wager body parts. I did it once as a stupid teenager, and won. Please, be smarter. If you want faster, get a 9X21, or a .357, or something similar, and forget about the Parabellum.
Steve
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