231/hp38 is a good powder for that load. It's been mentioned, but I'll second it, go with the upper midrange of the load data. Lower than that, for me, stovepiped once, and burns a little dirtier. My most recent batch was 115 FMJ over 4.9gr. I think the loadbook max I was working with was 5.1, so that's getting up there, but it shoots great in my sigma.