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The zero range, , is important because corrections due to elevation differences will be expressed in terms of changes to the horizontal zero range. For most rifles, is quite small. For example, the standard 7.62 mm (0.308 in) NATO bullet is fired with a muzzle velocity of 853 m/s (2800 ft/s).
Any errors in range estimation are effectively irrelevant, as a well-aimed shot will hit the torso of the enemy soldier. No height correction is needed at the "battle zero" or less distance, but it can result in a headshot or even a complete miss. The belt buckle is used as battle zero point of aim in Russian and former Soviet military doctrine.
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Computer games that accurately model the ballistic trajectories (including velocity) of firearms also require leading of fire, much as in real life. This applies equally to combat aircraft (or even combat spacecraft) simulators, where the velocities of the craft involved are great enough to require leading with projectile weapons.
This is the process of adjusting the scope so that the bullets' points-of-impact are at the point-of-aim (centre of scope or scope's cross-hairs) for a specific distance. [9] [page needed] A rifle and scope should retain its zero as long as possible under all conditions to reduce the need to re-zero during missions. [9] [page needed]
The three main technologies employed for long-range shooting—the bolt-action rifle, telescopic rifle scope and machined cartridge ammunition—were developed in the nineteenth century. The first bolt-action rifle was produced in 1824 by the German firearms inventor Johann Nicolaus von Dreyse. The first documented telescopic rifle sight was ...
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