ya know... the 38 super never got any respect in recent years... most semi rimmed cartdges don't... worse... Colt tried to headspace em on the rim.
In the old days before the .357 the 38 super was one mean round in a pistol... an autoloader at that.
Apparently... a good barrel that headspaces on the case mouth will give a 38 super some real tack driving accuracy.
lazs