The psi for the 9mm is the same as the 357 at 35,000 psi. The 9mm +p is even higher at 38,500. Do not be deceived by these numbers. The case capacity is why the 357 outperforms the 9mm +p.
I get 1750 fps from my 6" 357 with 125 grain bullets. I use Laser hardcast with Accurate #9. You are not going to even come close to this with a 9mm. There is not enough case capacity to handle the volume of the slower burning powders. To match this velocity the 9mm you would need a faster burning powder, that creates more pressure, putting it over the safe zone of 38,500.
There are exception to all these rules with a revolver or auto built to handle higher SAAMI pressures. For example: The Blackhawk and Redhawk 357s could be loaded to blow the doors off any argument if need be. The case capacity has the final say!
Gun permit?? A bread crumb tossed to a sleeping society awoken by the sound of complacency. "They are for your own good", and "you will understand when you see all the lives they save". Yes master, what else will you toss me from your bag of infringements?? Do you want me to roll over and play dead? I do that very well. --skidder