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Sighting in a firearm is an important test of the ability of the firearm user to hit anticipated targets with available ammunition. Pictures or silhouettes of intended targets are less suitable for sighting in than high contrast shapes compatible with the type of sights on the firearm. Contrasting circles are commonly used as sighting in ...
Rifleman's rule is a "rule of thumb" that allows a rifleman to accurately fire a rifle that has been calibrated for horizontal targets at uphill or downhill targets. The rule says that only the horizontal range should be considered when adjusting a sight or performing hold-over in order to account for bullet drop.
Mean point of impact (MPI) is the calculated center of the grouping, which is the average center of all the shots, and is not necessarily located at a hole in the target. [2] The process of mechanically readjusting the gunsight's point of aim to match the MPI is called sighting in or "zeroing" the gun.
Boresighting is a method of visually pre-aligning a firearm barrel's bore axis with the target, in order to more easily zero the gunsight (optical or iron sights). The process is usually performed on a rifle, and can be accomplished either with the naked eye, or with a specialized device called a boresighter. [1]
Known also as "battle zero", maximum point-blank range is crucial in the military. Soldiers are instructed to fire at any target within this range by simply placing their weapon's sights on the center of mass of the enemy target. Any errors in range estimation are effectively irrelevant, as a well-aimed shot will hit the torso of the enemy ...
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A milliradian (SI-symbol mrad, sometimes also abbreviated mil) is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0.001 radian). ). Milliradians are used in adjustment of firearm sights by adjusting the angle of the sight compared to the barrel (up, down, left, or
Originally "zero", meaning 6400 mils, 360 degrees or their equivalent, was set at whatever the direction the oriented gun was pointed. Firing data was a deflection or switch from this zero. The other method was to set the sight at the actual grid bearing in which the gun was oriented, and firing data was the actual bearing to the target.