Maybe - maybe not...Read the OP's post. There is no .357 involved here.
Elmer Keith loaded up some potent stuff in the .38 spl that rivaled the .357 max (note - not .357 magnum).
Taffin says he gets over 1400 fps. from the Keith load out of an 8 3/8" barrel.they were no where near .357 Max. territory