I bore site mine by pulling the bolt, looking through the barrel and lining it up with a target at 20-30 yards (sometimes I can do itat 100 yards as well). Make sure it is in a good rest and does not move while adjusting the reticle to appear to be centered on the target that is centered on the bore. Should be real close. Shoot a three shot group. Adjust reticle to center of the group. try another 3 shot group. If not good, and the mounts and rings are tight (and no sign of the rings shifting in the slots o the bases) I will say it's a bad scope. Mount a different, known-to-be-good scope and see what you get. ALso, you may very well be shooting about 2 inches low at 20 yards because the scope is actually mounted above the bore and the bullet must shoot at an upward angle before its path actually crosses the line of sight. Typically, it may be a little low at 20 yards, right on at 100, a little high at 150 (still climbing) and then it starts dropping again just beyond that.
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