Current data from Hodgdon:
http://data.hodgdon.com/main_menu.asp
(powder manufacturer)



Hodgdon Powder Company
Cartridge Load Recipe Report - 9/29/2011
data.hodgdon.com 357 MagnumLoad Type: PistolPowder: 231BW: 125 Cartridge InformationCase: WinchesterBarrel Length: 10"Twist: 1:18.75"Trim Length: 1.285"Primer: Winchester SPM

357 Magnum Cartridge Load DataStarting Loads Maximum Loads
Bullet Weight (Gr.)PowderBullet Diam.C.O.L.Grs.Vel. (ft/s)PressureGrs.Vel. (ft/s)Pressure
125 GR. CAST LRNFP 231 .358" 1.580" 4.6 1052 13,800 CUP 5.5 1185 18,800 CUP
125 GR. HDY XTP 231 .357" 1.590" 7.3 1335 33,800 CUP 8.5 1514 42,700 CUP
NEVER EXCEED MAXIMUM LOADS

I've been loading near max 125JHP per these data for decades with no problems.

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Science plus Art