I sight all my rifles at 25, after bore sighting. Draw a 15mm black dot on white paper, fire one shot, and shift scope accordingly. Usually it only takes 2 shots, you can see them easily at 25. Then I move back to 100 and fire a 3 shot group. Depending on calibre, the group is usually with a few centimetres, and then adjust scope accordingly. But most rifles sighted at 25 will be very close at 100. And most of my rifles only need the 2 at 25, and the 3 shot group at 100 to be bang on.
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