38.5 grains of IMR3031 with a 150 is a classic load that is very accurate. Start down around 37 and work up in 1/2 grain increments till you get the accuracy you desire while watching for the standard pressure signs.
W748 can be very accurate with 150's as well. Check your load data, but something in the area of 42 grains is max.
Read Ken Waters articles from 1976 and 2000........think PET LOADS.
Last edited by 300jimmy; 08/07/13.
