180 grains is as far as i have gone with my Max's. I also have stayed away from cast bullets. I know it is doable but if you get them close to the velocity of the 180 grain bullets you might consider gas checks. My 180 grain load:
CASE
MAKE Remington
CALIBER .357
HEAD STAMP 357 MAX
TRIM LENGTH 1.590
OVER-ALL LENGTH 2.15
BULLET
MAKE Speer
WEIGHT 180gr
TYPE JFP
DIAMETER .358
BALLISTIC COEFFICIENT .124
POWDER
MAKE Hodgdon
TYPE H110
CHARGE WEIGHT 21.3gr
PRIMER CCI 400 (small rifle)
WAD NONE
BALLISTICS
MUZZLE VELOCITY 1875
SIGHT-IN RANGE 75yd
GROUP SIZE .75
EXTREME SPREAD 56.1
STANDARD DEVIATION 13.4