I picked up a S&W model 66 .357 magnum today (6" barrel). I have been doing a lot of reading as far as what type of ammuntion should be used. But I would like to get some readers opinions. For the people who shoot this revolver, what kind of ammuntion do you use. Is there a type of magnum cartridge that is safe to shoot all the time in this gun or should .38 +P be used only?