If I am checking zeo I start at 100yds and shoot 3 shot groups. I go by the center of the group for adjustments. If it is a new scope I bore sight at 25 and a 3 shot group. Adjust and move to 100 and sight in. Then I like to double check at 200 just to make sure things are on the up and up. One thing I do different is I barely hold the rifle. Only light pressure around the pistol grip. This method gives me great groups. Of coarse try to do everything the same each shot. My thought has been death gripping brings in to much human error. Then when my field is combined I have started taking my gong out for longer range verification.
As Cat said the more you can shoot the better you will get. This shooting should be serious concentrating on shooting a tiny group shooting. If it isn't you will just create more bad habits. None of us need more bad habits do we.
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