The SUPER .38 was introduced by Colt in .38 ACP in 1929 as a law enforcement handgun to be able to better penetrate the bodies of the new fangled automobiles and the body armor being worn by gangsters at the time. By the early 1930s the velocity had been boosted to 1300 fps but the name on the box was still .38 ACP. It was also advertised heavily to sportsman as a "handgun round that could kill anything" because at the time it was one of the highest velocity handgun rounds made. Ammo was all 130 grain but there were both FMJ and HPs available. No clue why but the HPs were eventually discontinued.
Have heard that some double-stack Supers had problems feeding the standard semi-rimmed case which is why the SuperComp case came to be. I've never owned a DS so I have no experience with it...
mega...Colt did make a .38 Super 1911 style handgun for a while that you may have liked...it was called the Double Eagle... Don't see many for sale any more...
Bob