(2) Most pistols that are used in competition today are equipped with adjustable sights which are easily moved by a screwdriver or a small coin.
(a) There are many makes of adjustable sights available on the market today. The sight adjustment screws do not all move in the same direction for a given adjustment. Clockwise will move one sight to the right and move another sight to the left. This also applies to elevation adjustment. Another difference is that each sight does not move the strike of the bullet the same distance per click. Some of these sights are more durable than others.
(b) The primary consideration when you are using adjustable sights is that you know the capabilities of your sights. How far one click in elevation moves the strike of the bullet at 50 yards, etc., on your pistol, is important to correct zeroing and adjusting.
(1) We recommend that you start your zero at twenty-five yards. Fire at least three rounds slow fire before moving the sights.
Figure 4-1. Sight Change Example.
(2) Check your group in relation to the center of the target and if necessary, make a bold sight change. Do not creep to the center of the target one click at a time. Also, repeat the shot group method to establish a 50 yard zero. Do not try to zero by moving your sights after you have fired only one round. One round can easily be off because of errors committed by the shooter.
The shot group is equivalent to an 8 ring or a four inch error at 6 o’clock in elevation. If the sight moves the strike of the bullet one-half inch per click at 50 yards — approximately eight clicks increase in elevation are needed. The group is equivalent to 7 ring or five and one-half inch error in windage at 3 o’clock, approximately eleven clicks of left windage are needed. (Refer to scoring ring dimensions in Sight Adjustment Card)
(3) Exception to the shot group method may be made when a shooter with extensive experience is firing in a match and has called his shot good, but the shot was not located on the target in relation to his call. Analyze your shooting performance. You may determine that an immediate sight change is necessary, but do not be in too great a hurry to move your sights, as the chances for error caused by faulty technique are many.
(4) When the group is centered you may wish to fire 10 and 20 second strings to confirm the zero at 25 yards. There will possibly be a change required when shooting timed and rapid fire.
(5) Never “Hold Off” or use “Kentucky Windage” with adjustable sights. The shooter will force the shot to break at a specific spot instead of allowing the normal arc of movement. If you are grouping away from the center of the target, adjust the sights to compensate for the error. Mark and record your zero sight settings
(a) It is a good idea to mark the sight adjustment screw with a small drop of nail polish or airplane dope to indicate the position of the 25 yard and 50 yard zero.
(b) You may also set the elevation screw down to its lowest point, counting the clicks as you do and record the number of clicks up from the bottom for both settings, This way you record the number of clicks from the base of the sight up to your 25 yard and 50 yard zero. (This method is used only for elevation.)
(c) You may also make a sight adjustment card on which you can record the zero position of the windage and elevation screw for all weapons. At certain times on different ranges, and under various weather and light conditions, you may find your zero changes slightly. (Figure 4-2).
Figure 4-2. Example of Sight Adjustment Card.
(6) A scorebook which has provisions for you to write in your sight settings for specific ranges, light and weather condition, and hard to remember data is a necessary item of equipment (Figure 4-4). Unusual zero changes frequently appear without reason. Some things to check are as follows:
(a) Check the spotting telescope: You may be scoping the adjacent target. Adjusting your zero to compensate for another shooter’s grouping frequently happens.
(b) Check front and rear sights. The sights may have become loosened from the recoil or bent or damaged. The rear sight may have worn notches in the adjustments and would allow recoil to disturb the sight setting or when an adjustment is attempted, the sight would not move in the desired direction.
(c) Errors in position and grip may cause the hold and sight alignment to drift even though the shooter may have made a correction. An artificial correction is made to compensate for errors. At the shoulder it affects the hold, and at the wrist it affects the grip. An integral shift in body position should be made by moving the rear foot in the direction of the error in the hold and the grip should be shifted by sliding the grasp of the hand on the grips of the weapon toward the error. If a natural position and grip are attained, the tendency to point at other than the aiming point will be removed.
(d) Positive action is urgently needed when any of the above situations are present. Make a quick check of the scope, position, and grip and then continue until it is apparent that the difficulty is not being remedied. A bold change in sight setting should now be made.
(e) In the case of a sight damaged beyond use, ask the range officer to permit you to declare the weapon disabled and change guns or have it repaired by a qualified gunsmith on the range.
(f) The scorebook may indicate a large change in sight adjustment for the pistol range on which you are firing. Changes in light angle or light intensity may affect the zero that you use on the home range.
(7) Upon completion of firing, a consultation with your gunsmith might uncover certain changes in the fitting of components, wear, burrs or foreign matter that can alter the mating of finely fitted parts. Any of these may cause a change in zero.
2. Preparation in the Assembly Area: Before you can employ a systematic technique of shooting, a systematic preparation phase must be established. Actually the shooter’s over-all preparation starts the first time he attempts to improve his shooting ability. However, important steps can be taken during the period immediately before shooting that will favorably affect control and coordination.
a. Physicaclass="underline" The shooter must first complete his preparation in order to fully concentrate on shot delivery. The important thing to remember is to perform all operations and checks before record firing. Otherwise, the shooter will have to alter his system of control to compensate for the time lost in searching for an emergency solution.
(1) A shooter should eat light but nourishing food so that there will be no feeling of hunger before shooting, or a sensation of being stuffed. Avoid drinking a lot of water before and especially during shooting. Heavy food and too much liquid raises the pulse beat and induces excessive perspiration, thus weakening the body during shooting.
(2) Before shooting the shooter should do mild limbering up exercises: static tension exercises, walking, dry firing, etc., will revive blood circulation after sleep and help balance the nervous system. If a shooter starts shooting shortly after awakening, without limbering up, he will not be steady. His reactions are too slow, and his movements will lack coordination.
(3) The shooter should report to the range at least 15-30 minutes prior to firing time. This is necessary for equipment preparation and the shooter will also have a chance to relax and become settled during this period. Carrying a heavy gun box puts a strain on the shooter and no effort should be made to shoot for a period after such exertion.
(4) Checking the firing point from which a competitor will shoot must be given due attention.
(a) The shooter must choose the best place to shoot from. On a bright day, for example, the position should be slightly back, to allow shooting from shadow if possible, or he must place himself to the rear of his gun kit so as to be in its shadow. Establish your position in such a way that it will not be necessary to change once the shooting begins. Shooting glasses to prevent the sun from shining into the eyes should always be used.