First, make sure it's not you. Shoot it off of sandbags (hold the gun normally, support yout hands with the bags). Have others shoot it.
Could be grip, too much finger in the trigger, anticipating recoil----
If it is indeed shooting low, try a heavier bullet. If you are shooting
115's, go to 124's. Still low? Try 147's.
Beyond that, it's time to mess with the sights. Someone must make
taller rear sights?