I picked up a S&W M 66-1 the other day from a local dealer. I was well aware at the time of the stories about using .357 Mag loads other than the 158 grain and cracking forcing cones. Since I mostly got it for IDPA, I will be shooting mostly .38 rounds and was not bothered by this since the frame is just right for my purpose. I was just curious as to how many of you have the 66 and who have seen this issue first hand....