[castnblast]

If you are shooting 5" groups, w/ that variety of ammo, I'm in the camp that says you're anticipating the shot, and/or, your gun hates 180's. If I were shooting an '06, Id be shooting 150-165's. Much flatter trajectory, and a little lighter on the shoulder. Also, get a bore snake cleaner and run it through your rifle dry. One other thing I would check is the crown of the barrel. Make sure it's not messed up.