I just checked my Model 360PD and there is no rattle. I have shot about three times as much as you. I also checked my Model 60 and there is no rattle. I checked my Model 357PD and there is a slight rattle. It comes from the rear sight moving and is within tolerances according to S&W tech. Of course, all guns were unloaded or the shells would rattle in the cylinder. That is all I can tell you. MV out!