47 gr's is THE book load with a 150 (you're shooting a 155). Can't see any reason to go over, especially given that group. You can certainly play with seating depth, though I'm not sure why at this point.
I'd go shoot three more groups @ 47gr's and see if the original group result holds up. If not, then play with seating depth.
Same here, me being me, I'd seat them 5 thou shorter and see what comes out of it. Looks like a node in the 46-47 range. While 46.5 was larger, I'd still be inclined to monkey around between 46-47 grains with the that and see what you come up with. They are easy to tune bullets. Like to see the speeds as well, but the accuracy looks great across the board.
