My first S&W was a Model 19 I bought new in 1974. It was a great gun - very accurate and enjoyable to shoot. But I was a newbie handloader at that time and although I shot it most with 148-grain hollow-base wadcutters loaded lightly for target use, I did run my share of hotly-loaded magnum fodder though it. Eventually, sticky extraction reared its ugly head.
It got so bad that I had to bump empty cases out of the cylinder with a drift and mallet so I sent it to S&W for repair. They replaced the cylinder under warranty, saying that the chambers were out of round from, they suspected, hot handloads and cautioned me about my ammunition choices. Of course, I assumed they didn't know what they were talking about because my primers were not heavily cratered. I figured I had just been unlucky enough to get a defective cylinder.
But a year or so later, extraction that was painful to the hand started again. S&W replaced the cylinder a second time but warned me in a letter that they would not do so a third time.
My point is that K-frame magnums can be damaged in more ways that those involving cracked forcing cones and flame-cut frames. Today, I consider the K-frames to be my favorite S&W revolver and remind newer owners of them that there is no need for a steady diet of full-house loads in any handgun, let alone one that is about as perfect as revolvers get and is no longer available new.
Ed