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.) ELEVATION General rule for changing the elevation after hitting the target: A change of elevation either up or down, of 100 yards on your rear sight, will raise or lower your bullet in inches on the target equal to the square of your distance in yards from the target. I.e., a change of 100 yards in elevation on the rear sight leaf while firing at the 200-yard range raises or lowers the striking point of the bullet at the target 4 inches. A similar change while firing at the 300-yard range raises or lowers the striking point of the bullet 9 inches, at the 400-yard range it would be 16 inches, at the 500-yard range 25 inches, and so on. The following illustrations are self-explanatory in regard to windage and elevation changes and should be diligently studied during preliminary instruction. The effect of windage changes (given in points) will be found at the bottom of each target, while the effect of elevation changes (given in yards) will be found to the left of each target. [Illustration: TARGET A, 6' x 4' TARGET B, 6' x 6'] The above system of indicating the windage and elevation on each target is used in the United States Marine Corps score book. Each man at Plattsburg, in 1916, was supplied with one of these score books. If used at the firing point they greatly simplify sight adjustments, besides containing other very useful information on shooting. 5. Gallery Practise. Purpose 1. To note errors in the position of the man while he is in the act of firing and call his attention to them after he has fired. 2. To give instruction in squeezing the trigger properly. 3. To stimulate and maintain interest. 4. Offers a check on what the man has absorbed from the other preliminary drills. Fire just as much on the gallery range as you company commander will permit. You cannot fire too much. Every shot you fire should teach you a lesson on some point connected with the art of shooting. SLOW FIRE Following satisfactory gallery practise scores the men go on the range for known distance practice. Here the army rifle is fired with service charges at known ranges; first, for instruction if time permits, and then for record. To obtain satisfactory results the firer must perform correctly five essential things, namely: 1. Hold the rifle on the mark. 2. Aim properly. 3. Squeeze the trigger properly. 4. Call the shot. 5. Make the proper sight adjustment. They will be briefly and separately discussed: