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Magnus effect
A moving, rotating pellet in the air, drags some of the air around with it, in its direction of rotation. This increases the speed in that region, and thus the pressure is lower. Consequently, there is a net force on the pellet in the direction of spin, perpendicular to the forward movement of the pellet. This is called the Magnus effect.
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Mid range trajectory
In its curved path, the highest vertical distance reached by a pellet above the line of sight. The term is a misnomer as the highest point in a pellet’s trajectory does not occur at "mid-range" but slightly beyond ( due to the bullet’s progressive slowing, the curve is in the form of a parabola, not a perfect arc ). MRT figures also apply to given loads and also depend on the height of the scope ( or sights ) above the bore. Useful for determining how low one needs to aim when a small target is closer than the zero range of the scope.
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Mil
An angular unit of measurement equal to 1/6400 of a complete revolution (there are 6400 mils in 360 degrees). The mil is used to estimate distance and size based on the mil relation formula: 1 mil equals 1 meter at 1,000 meters. There are 3.375 MOA in 1 mil.
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Minute of Angle
Referred to also as MOA, it is a angular unit of measure used to describe the accuracy potential of rifles, and pellets. One MOA equals 1/60th of a degree ( 21 600 minutes in a circle ) and subtends 1.047 inches at 100 yards, or, for practical purposes, 1" at 100 yards. In hunting terms, a rifle/load which, at 100 yards, can consistently place five consecutive shots in a cluster measuring 1" between the centres of the two outermost holes ( "minute of angle groups" ) is considered extremely accurate. For Benchrest competitions the figure is obviously much less.
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Muzzle
The end of a gun barrel from which the pellet emerges.
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Muzzle brake
Device at the muzzle end usually integral with the barrel that uses the emerging gas behind a projectile to reduce recoil.
Related Words Compensator
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Muzzle energy
Also referred to as ME, is kinetic energy or force carried by a pellet as it exits the muzzle of a rifle.
Related Words Energy
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Muzzle Velocity
The speed of a projectile as it leaves the muzzle of the rifle.
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