I would first check your scope mounts and base, make sure all is tight. Then before you shoot bore sight it. Best way to start is open the gun, set it on somthing solid. Look thru the barrel and center on your target. Without moving the gun, look thru your scope and see where it is pointing. Try adjusting the scope to the same picture in the barrel. Once you do that, fire a couple rounds and see where that puts ya.
You might also start at 50 yards. I have even went as far as starting back at 25 yards.
Lonny