Aiming Straight

A sporting shooter is calibrating the sights in his rifle. The weapon is fixated to a bench, in a way the sight picture is centered with the target rings. Now, he fires a single round, that hits left and low from the target's center.

He has positioned the target 15 meters away, knowing his rifle characteristics and those of the ammunition he uses, the shooter can obtain a flat trajectory up to 300 m, making Gravity not a factor to be taken into account.

So, in order to get his sights right, how should he move the rear aperture?

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