See the links below for a little history on the heydays of the .38 Super:
http://www.americanrifleman.org/articles/the-super-38/
http://www.imfdb.org/wiki/Public_Enemies#Dillinger.27s_Colt_.38_Super_.22Machine_Pistol.22
You can also google "Melvin Purvis or John Dillinger .38 Super" for more details on the cartridge of choice in Chicago in the 1930's.
.357 Magnum appears to have killed it dead in its tracks.
http://www.americanrifleman.org/articles/the-super-38/
http://www.imfdb.org/wiki/Public_Enemies#Dillinger.27s_Colt_.38_Super_.22Machine_Pistol.22
You can also google "Melvin Purvis or John Dillinger .38 Super" for more details on the cartridge of choice in Chicago in the 1930's.
.357 Magnum appears to have killed it dead in its tracks.