Gee, why not got the Hodgdons web site and find the data for 158 gr bullets and W 231/HP 38?
Even though they use a Mag Primer it is not needed as per a phone call to them, they only used Mag primers to keep all data consistent . They use Mag primers for any/all Mag loads.
3.4 to 5.0 grs max for the 158 gr bullet in 357 Mag.
I use 5.0 grs for a nice target load.
Cartridge Loads - Hodgdon Reloading Data Center - data.hodgdon.com