Sgtsandman brings up a good point. The bipod needs to be loaded the same each time. Leaning into it with the same force may improve your groups. Also, what's your method for aligning the sights? The best thing is to set the rifle up for correct alignment in the bags with no human force applied except to the rear bag. When the rifle is aligned without you touching it, then wrap yourself around the rifle and load the bipod forward. The idea is for the rifle to have a natural position without you forcing it one way or another. Also be sure you apply the same pressure to you shoulder each time.