Super Vel wasn't the only high performance ammo back then, at least in .38 Special. There were two hotter loads, at least according to advertised figures. While Super Vel 110 JHP (1370) may have been the best seller, there was also the hottest factory load, the 110 Norma JHP (1526), the Remington 125 JHP (1370) and the Speer-DWM 125 & 140 JHPs (1150 & 1050). May have been a couple of others.

"Real" muzzle velocities of all these were likely less than advertised, but it didn't really matter because few handloaders had chronographs then and there was no way to verify.