Good evening all. I'm new to this site and thought it would be a good forum to ask a question regarding one of my new firearms. I just picked up a new S&W .38 Ultralight Bodyguard tonight. I noticed while shopping online for ammuninition that there is the option of .38 Special and .38 S&W. What is .38 S&W and how much does it differ from .38 Special ammo?