Boiling

M14a1 Rifle

i. SOILING WITH LATIRAL RIGHT TO LIFT

4. tOJUNGMTH LATIRAL LIFT TO RIGHT

i. SOILING WITH LATIRAL RIGHT TO LIFT

I"l In utilising the telescope to read the mirage the following adjustment technique is used: Pick out an object midway to the target and adjust and focus the scope at that point. Without disturbing the focus, adjust the scope onto the target. Since the scope is focused to read the mirage, the target will appear fumy.

c. Temperature. Temperature has a definite effect on the elevation setting required to hit the crater of the target. This is caused by the fact that an increase in temperature of 11° centigrade will bicrsaee the muxxle velocity by approximately 1.3 meters per second. Figure l,»0 illustrates the temperature effect on the velocity of match ammunition. Regardless of the range, the firer must change his sights I minute for each 11 degree change in temperature. For a drop in temperature the sigh In must be raised; for an increase In temperature the sights must be lowered.

d. Light. Light may or may not have an effect on the firer's aim. It affects different people in different ways. The general tendency, however, is for the firer to shoot high on a dull, cloudy day and low on a bright, clear day. Extreme light conditions from the left or the right may have an effect on the horizontal impact of a shot group. To solve the problem of light and its effects, the individual firer must accurately record the light conditions under which he Is shooting. Through experience and study he will eventually determine the effect of light on his zero.

#. Humidity. An increase in humidity decreases die density of the air and therefore decreases the air resistance. The effect, however, is very small and can be neglected for rifle fire at all practical ranges.

/. Exterior Ballistics. Although extensive ballistics tables are not required by the firer. it is di value for him to understand how and to what degree various factors affect the trajectory and velocity of the projectile.

TtMFIRATURI IPftCT ON VtLOClTifl 7A2 LC MATCH AMMUNITION

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