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The 357 is too much juice for the K frame. The early K frame. When the RHKP ordered their M10s in 357, they found they did shoot loose quickly, but being Briits, it took them a while to find out. S&W beefed up the K over the years and basically perfected the K in the 19/66. They can take a steady diet of heavy bullet 357. It wasn't until 110gr 357 loads started being carried by police agencies that problems started cropping up. Top strap cutting and forcing cone erosion is a possibility, but only with those 110s and many rounds. Modern bullet design has obviated the need for 110s in a service or defense roll.