Here's my 1942 M&P pictured with 500 rounds of +P (a 125@925, what a joke) and 600 rounds of +P+ (125@1,150, now we're talking) that I shot through it one time to see if anything would happen. Not surprising, nothing did. Note I don't subscribe to the model number is OK theory.
Here's a piece I wrote a few years ago.
Shooting with Hobie