imported post
The pressures of mentioned 9mm factory ammunition falls within the following parameters (according to a little research). I should note that this research will also turn up varying pressures of these loads, so using your head is probably the best advice.
NATO = 36,500
+P = 38,500
+P+ = 42,000
The Glock 19 is reportedly rated to handle pressures in excess of 43,000 psi. Kahr warns against the use of +P+ loads in any of its handguns (per phone calls to them), though I have also carried and tested the Ranger 127gr +P+ load in my K9 Elite '03 and my Glock 19.
It's a pretty safe bet to say that you are taking a chance of damaging your gun, and yourself, if you push the limits too far with some of the 9mm offerings out there. The worse case scenario would be if your gun self-destructed during its use in an extreme confrontation.