336A, it might be, I forget where I got the link. I have the manual, same one I started loading with in the 70's. My loads haven't changed from the loads in that manual. I still shoot 5.0 gains of Unique w/158 SWC in every .38 Special I own. It represents what the .38 Special was designed to do, launch a 158 grain bullet at 830/850 fps. That is what most are regulated for. Although that load is probably just borderline +P by todays standards it is still far more powerful than any factory loaded 158 SWC/RNL you can buy currently. Current factory RNL loading barely get 780 fps from most 4" revolvers forget about any 2", pretty anemic.
All calibers have been downloaded from their original configurations. Try to find a real .44 Special loading. .357 Magnum is right where the .38/44 left off not the 1600 fps barn burner it was designed to be. Same for .44 Magnum. Not sure if it is liability from the ammo makers or not.