I have looked this up in about 7 different books and site. The max runs from a little over 61 gr. to 65 gr. We have worked up to 64 grains with great accuracy and no signs of high pressure at all. It will put the 140 gr Bergers under 1/2 inch for 5 shot groups at 100 yds. I was just wondering what some of you were using with a 139 or 140 bullet and this powder.