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Bullet groups are measured from the center of a group of shots (normally 3 or 5)from the same distance.  Normaly if you can place a quarter in the center of the group and you eather touch or cover all of the holes you are shooting about a 1 inch group.  This is also the best way to zero your scope is to shoot a group of rounds (not just one) and then adjust the center of the group to the bulls eye.  Then shoot another group to confirm.  Using a good solid rest this should take about 3 or 4 three shot groups.