zeroing problems

NemoCaufield

Inactive
Question on zeroing a Bushmaster shorty ak. I followed the direction in my manual and on ar15.com
I left the front post alone and centered windage and put the rear sight elevation on 8/3 plus one click up using the smaller aperature using a 25 meter range. I fired a couple of shots adjusted windage and I had 1" groups. This was with all the above set. I thought that zeroing a 25 meters would set up my rifle for a 300 meter battle sight. So I then placed the target again at 25 meters. I clicked the rear sight elevation to 8/3 and put up the larger aperture meant for short range shooting from 0-200 meters. Then my shots for the 25 meters were way off. What did I do wrong? I thought that by doing the 25 meter zeroing my rifle would be good for all ranges? what happened?
 
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