Please guys, listen to the old man.
First, read this:
Demystifying +P The inside scoop on +P
If use of +P ammo is in question (and it should be for everyone regardless of gun age) for the gun you already own or are thinking about buying, CALL THE MANUFACTURE!
The question should be I have/buying a (fill in the blank: S&W model XX, S/N XXXXXX) and want to know if shooting +P is recommended by (fill in the blank: S&W, Ruger, Colt, Kimber....)? Follow up with; Can I shoot SWC lead reloads?
The answer you get will speak volumes about the company and the gun you are looking at!!! It will also take the liability off the FTF for answers blurted out by kool-aid drinking mark zealots.
Remember this, +P ammo is designed for archaic cartridges only! If some one is peddling a .40 S&W +P round it's a marketing ploy.