[Hammerslagger]

I will try to explain a basic concept relative to pressure induced wear in firearms with real world examples.

Take a "as new" or "NRA Perfect" condition, circa 1970, "K" frame S&W and use it to shoot Bullseye or PPC, using match target wadcutter loads that develop only about 8000 psi; and you will stress and wear the revolver little faster than just dry firing it with snap-caps. It will likely go about 100,000 shots/cycles before developing any mechanical problems that require relatively simple repair.

Take the same gun and start feeding it a diet of really hot 40,000 psi .357 Magnum equivalent ballistic performance loads and it will likely crack the barrel's forcing cone, stretch the frame, and become unserviceably loose in 3000 to 6000 shots.

A violent attacker might (but probably will not) experience a difference between regular and +P ammo. A paper target, definitely will not. Your gun will wear faster when you subject it to higher stresses.