The Max originally made its hunting reputation with 158 gr R-P JHP bullets, which to my knowledge was the only factory loading available in JHP. However, these were NOT the same 158 gr R-P JHP bullets which are currently so readily available in bulk. Remington designed a special 158 gr JHP for the Max that was much tougher than the soft 158 grainers made today, and had a more streamlined profile.
I bought my last .357 Max 158 grainers from Midway a few years back. So far as I know, those bullets were dropped from the Remington component line some years ago, and the remaining supply has long been exhausted. You might find some at a garage sale, gun show, or a gun shop that is going out of business. [An all too frequent occurrence these days.] Compared to the standard 158 gr, the Max bullet had a more rounded nose.