Keep in mind that the 9mm was intended to be shot from a handgun. When you start pushing the limits of the round, you may start to see problems such as split cases (jam in a bad situation) or primers being pushed out (jam in a bad situation).
The carbines were designed around the standard loads available for that cartridge. For safety's sake, I wouldn't push it too far.
However, as cohutt suggested, using a slower burning powder may help a teensy bit. . .but, if you use that ammo for handguns, expect lower velocities, potential failures to function and giant, pumpkin-sized flashballs.
Just some thoughts.
The Professor