elevation turret """
windage turret ballistic cam
Figure 131. Snipericop« u-ith mount.
c. Sight Picture. With bot h the iron and the optical sight. the firer aims at t 1b«* centcr of visible mu** of the targct <fi1341. Further* the rifle must not be canted. Canting ¡s (lie «cl of tipping the rifle to either aide of the vertical. Figure I3.> shows a proper si^ht pictun' in \vhich (lie rifle, or seope ftitrhl* and the rifle barrel. are in vertical alinement. Figure I3.~> shows the relation between the firer's line of sight «lui the line oi élévation of the rifle barrel (line of ahotl. As the bullet leaves the rifle, it ¡s headed for point À. but the foree of gravity causes it to <lrof> an<l strike the target nt point A-l. the desired point of impact. Figure 13"> illustrâtes a canted rifle; the sights are tipped slightly to the right. In thia instance, the firer s line of sight still terminâtes at point A-l on the target, but the line of the shotnow points to B instead of to A. The bullet drop* identically as in the first shot but the drop is from point B and the impact is at B-l. A more pronounced cant will move the bullet strike farther oilt and down as shown in the inset, figure I 3.~>.
d. fireathing and Aiming Process. If the firer breathes while tr> ing to aim. the rise and fall of his cheM will cause the rifle to move vertically. Sight alinenient is accomplished during breathing but to complete the process of aiming, the iirer must |>e able to liold his breath. To properly hold his breath, the firer inhale, then exhales normally and stops at the moment of natural respirator} pause (fi>; I3fii. If the firer does not have the correct sight picture then he must adjust his position so that he can obtain the correct sight picture without the use of muscular strain to hold the weapon. The breath should not be held for longer than 10 seconds since this results in dimming vision and increasing muscular tension. While exhaling and holding the front sight up to the target, the focus should be repestedly shifted from the front sight to the target until thefirer determines that he hss a correct sight picture. When the sight picture has been obtained, the focus should remain on the front sight until the round has been fired. Fins] focus must be on the front sight to call the shot sccurately and detect variation» in sight picture and sight slinement. Under adverse light conditions, when the target appears indistinct, the firer has a tendency to focus beyond the front sight at the target. Thst must be avoided.
Figur* 134. Sumptê tight picture* (optics! tight*}.
holding of rreath in order to produce a shot ordihary respiratory cycle deeper inhale and exhale
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