I just recently purchase a S&W 340PD last week. I went to the range this weekend to test it out. I shot 15 round of S&B 158gr FMJ and 5 round of Hornady Critical Defense 125 gr FTX. When I was cleaning it, I notice that the front of the cylinder is pitted and it was not like that before I shot it. I already know not to shoot anything in .357 Mag below 120 gr but what the H***?