Ok im not sure if this the right place in the hide to ask but here goes. The weather is aweful and i want to resight 2 ar's one with eotech and one with a leupold vx-r 1.25-4x20 and a bolt .308 with a leupold 6.5-20x50 mk4. How do i sight in at say 25 yards? I have no problems sighting in at 100 or 500(.338 lapua) but 25 ive never done. Thanks guys.