The posts have been lost in a forum re-do here, but I told the story of my 1969 vintage M41 that I had bought new, and CCI high velocity ammo from a couple of years ago.
Partway through a magazine on a range day, I had the original, very nice grips both blown off in pieces, and the bottom of the magazine was blown wide open. I was standing there holding bits of a very nice 41 in my hands. I was lucky to come away with only a stinging hand and all my fingers still attached.
After removing the barrel for inspection at the range desk, we decided to send the whole lot to CCI, the pistol and the remainder of the box of ammo.
It turned out that the case had separated right at the rim, and most of the energy had been directed downward into the magazine and grip area. The head of the case was firmly stuck to the face of the bolt when they inspected it. The very nice gentleman at CCI donated the grips off his own 41 as replacements, and replaced the magazine with a newer one. The rest of the gun survived intact.
A week or so later, a large case of CCI standard velocity arrived at the house, courtesy of CCI.
I knew better than to shoot hi velocity rounds in my M41, but I let the range operator sell me the couple of boxes of hi velocity because that's all they had at the time. There's nothing to say that this wasn't just a fluke, but there is no way anything but standard velocity will every get used in that gun again. S&W recommends only standard velocity - maybe they do know best.