I have used 180 gr 357 Magnums for years in Colts and S&Ws, Hawes, ASM, and Rugers for cowboy shooting. I have hunted with them and competed and target and just plain shot cans with the 357 Magnums I own. I stay away from Cor-Bon and Georgia Arms HOT and light loads in the 125 gr bullet. Heavy and slow works. The fact is, I have only witnessed one K frame that even had a problem. It didn't KB. It simply stopped functioning. It was a WWII Victory prefix that a guy was running 158 gr 357 Magnums through. Somebody had bored it straight through. An unmolested factory stock K frame will run for years. The NYSP proved this with their M13s. You can break anything if you abuse it long enough.