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Sight-in procedure: mount gun in a bench rest or on sandbags such that it can be fired without the shooter supporting it in any way, except to absorb recoil. Align the sights to produce the desired sight picture, e.g. center bullseye, or six o'clock hold, etc. Fire 3 to 5 rounds without changing the Point of Aim (POA). Note the center of the group, called Point of Impact (POI), and it's relationship to the POA. Adjust the sights as follows: move the rear sight in the direction that you want the POI to move to match the POA, or move the front sight in the opposite direction necessary to make the POI match the POA. That is, if the POI is high and right from the POA, move the rear sight down and left or the front sight up and right. Fire another 3 to 5 shot group and note the amount and direction of the POI movement relative to the POA. Use this as a baseline for further adjustments.
Setting the gun up so that the POA is on the POI initially and then adjusting the rear sight to move the POI to the bullseye can work but it involves moving the gun in the rest if the first adjustment isn't sufficient. That disturbs the setup and can lead to having to fire more rounds than necessary.
Never, ever make a sight adjustment on the basis of the location of just one round.
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