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Military Handbooks: The Plattsburg Manual Advanced Training

The rear sight is set on a movable base so that it can be moved to the

right or left and the aiming point shifted accordingly in order to

counteract the effect of the wind on the bullet.

General Rule. To shift the striking point of the bullet to the left

move the rear sight to the left. And, of course, the reverse holds true

when it is moved to the right.

A Specific Rule. One point of windage moves the striking point of the

bullet 4 inches for every 100 yards you are distant from the target.

(One point of windage at 200 yards causes the bullet to strike 8 inches

to the right or left of the line of aim; one point at 300 yards causes a

12-inch deflection of the bullet; one point at 500 yards a 20-inch

deflection, and so on.)