All concerns regarding +P ammo are based on the assumption it is a "hot load." This is not correct as +P is loaded well below the maximum allowable pressure for the caliber. I worry a bit about guns made before around 1925 or so due to the vagaries in metal tempering up to that time. A K frame made in the 1930s would not cause me a moment of hesitation in using +P if I wanted to do it.
Again, here's my 1942 M&P pictured with 500 rounds of Remington +P and some of the 600 rounds of +P+ I ran through it to see if anything would happen. It came as absolutely no surprise to me at all when nothing did. Understand the revolver was already much used and well worn when I started. Still no observable effect. Others disagree, and issue cautions regarding the use of +P in older guns, but I don't understand their concern with a load that is well under maximum allowable pressure.
