I recently purchased a model 700 sendero in 300 ultra mag. I cleaned and J&B lapped the bore before firing the first shot. The first shot hit 1 1/2" high at 100 yards. Since it was so close I decided to just shoot it and break it in before adjusting the scope. In the process of firing 25 shots or so, my POI has shifted 3 inches to the left. Is this normal, or do I need to worry about it?