357/38 working load.

[Nick_C_S]

Kind of going along with 44 AMP's post: A couple decades ago I contacted Smith & Wesson regarding if I could shoot +P 38's in my Model 60 (5-shot, J-frame snubbie).

Their response was (paraphrasing): "All of our steel frame 38 Special revolvers can shoot +P ammo with no problem, whether we put '+P' on the barrel or not."

 

[Unclenick]

That's why SAAMI has the proof specs the same in their standard. They know no matter how much reading of labels they ask people to do, many will ignore them and load and shoot anyway. May it wear the gun out faster? It'll wear any gun out faster whether it says +P or not. It was only that early aluminum Airweights that had a problem, and, IIRC, they advised customers not to shoot them too much, even with regular ammo. Emergency gun, not a practice gun, apparently.