there is something else you might wana try.... Myself I bore sight my rifles on the bird house in my yard, its about 35 yards from my window, so I would remove bolt and sight scope to the round entry to a bird house, by looking thorough barrel and adjusting scope accordingly, anyway that's me, this way I usually 2 - 4 off @ 100 yards. Then you can hit your rifle's buttplate on the floor imitating recoil, then look through the barrel and scope if you lost zero scope or bases or rings are no good....
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