I've been told by a competitive shooter, who already reloads his own ammo for almost 3 decades, that a different primer rarely significantly increases the PF, but in some rare instances it can increase, but no more than max. 0.5-1.5 PF. Myself, I've reloaded 9 mm major ammo over the past 4 years with CCI, Federal, Magtech, Fiocci and Winchester SPP, but I have not noticed any PF changes using otherwise same reloading components and COAL's and testing with a Labradar to measure the PF.