really i wouldnt be asking my self whats wrong with the rifle i would be asking my self what am i doing diffrently (i.e. shooting positions, how you are holding the rifle) you might also be thinking to much about how your group is going to be as opposed to firing the current shot. the other thing you might be doing is as you are working the bolt to chaimber the next round you might be taking your face off the stock and then repositioning in a slightly diffrent place. while it might not seem like much it definitely could be one of the reasons. also you could be jerking the trigger instead of a slow steady squeeze.