I have to second Jim Watson's advice. I don't think the PP is a suitable platform for 9x19mm.
I cannot locate the pressure specs for 9mm Ultra. I suspect that CIP has a spec, but I don't know what it is. I don't believe SAAMI has a spec for that load. But if I had to guestimate, I'd say the max pressure of 9mm Ultra is far closer to .380 ACP's 21,500 psi than 9x19mm's 35,000 psi.
As Mr. Watson noted, the PP is a blowback gun, and not a locked breech. The only blowback guns of which I am aware that can handle 9x19mm have far heavier slides and springs than the PP.