How about out of a Speer manual dated 1970? Loads as follows for jacketed bullets:
38 Special- Test firearm Smith K38 6"
158gr-start 11.5grs, max 12.5grs =1077'ps
160gr-start 10.0grs, max 12.0grs =976'ps
357 Mag- Test firearm Smith Model 27 6"
110gr- start 20.0grs, max 22.0grs =1532'ps
125gr- start 18.0grs, max 20.0grs =1467'ps
158gr- start 14.5grs, max 15.5grs =1221'ps
160gr- start 13.0grs, max 15.0grs =1131'ps
Speer lead bullet
158gr SWC start 14.0grs, max 15.0grs =1243'ps
AS you are probably aware, the 357 mag is a whisper of what it's original design was, with far lower pressures than back in the 60's. The original design had pressures at 47,500 CUPs but few pistols, namely Smiths, could stand up to a full diet of full house loads. Since all of the cheap imports have hit our shores, the pressures were reduced again to compensate for the cheap crapola folks were buying for pistols. It's not much of a magnum today.
