The .38super is based off the .38acp.(same case dimensions) The .38acp predates the era of the notorious gangsters of the prohibition era by decades. The Colt 1900 could not handle the .38acp in original form (which was close to .38super) so they scaled it back. When the more robust 1911 came about they could go to the more powerful .38super.
Last edited by dkf; 12-10-2012 at 21:36..