My concern is over-driving the bullet...pushing it beyond velocities that it was designed for.
That was good for a chuckle early in the morning.
What is the concern? That you are going to drive it so fast the bullets will disintegrate when they leave the barrel? Not likely to happen at 9mm velocities. That they will not penetrate/expand correctly in soft tissue? It's not like you are going to use this on big game. That the bullet will overstabilize and not be accurate out to 300 yards? Hey, this is a 9x19 we are talking about.
Methinks you are overanalyzing.