Ah, yes Grasshopper... you have stumbled onto the great problem with the .38 Super: factory ammo!
The original idea of the Super was focused on penetration. In the late 1920s and early 1930s (heyday of the "motorized robbers") the cops complained that their .38 Specials couldn't get through the car bodies. Colt souped up the old .38 ACP and loaded it with a pointed, 130 grain FMJ. All penetration and little energy transfer.
But, all those old .38 ACP guns were still floating around, out there, and by the 1970s the lawyers were telling the ammo companies to tone it down or face ruinous lawsuits. The last batch of factory Super ammo I clocked passed over the screens at a wimpy 1080 FPS! This is, by the way, the same velocity achieved by the .38 ACP. See what happened? They quietly began loading the Super to the same pressures as the older cartridge.
Another strike against the Super is that it never really caught on big-time, so the lack of demand has limited what the ammo makers have offered.
The Super is one of those calibers that requires hand loading. I load lead 125 RN at 1,150 FPS for plinking and 115 JHPs at 1,500 FPS for carry. Yes, these bark but I have used them without trouble in both a Gov't Model and a LW Commander (although sparingingly in the alloy gun).