Those groups are not the cause of ES. I can shoot 2000 MR or 8208XBR in a 1:7.5 Krieger, and it will shoot in the .3s consistently, with a 75 Amax or ELD. It has been a while since I chrono'd this rifle, but it will kill milk jugs at 1000 without an issue, as long as I can get the wind call right.