For many years the .38 Super was plagued with accuracy problems, mainly because the chambers of the 1911 Colt pistols in this caliber were designed to allow the cartridge to headspace on its almost nonexistent rim. Sometime in 1988, Colt officials decided to follow the lead of custom barrel makers by allowing the mouth of the .38 Super case to headspace against a shoulder in the chamber.
It had a brief resurrgence among competion shooters for reasons stated in a previous post. However, the accuracy and other performance issued previously mentioned assured the popularity was to be short-lived.