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ACTION
The part of a firearm that accepts a live cartridge, fires it, and ejects it.
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ANGLE OF INCIDENCE
The angle at which an object strikes a surface
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APEX
The top most point of a cone, triangle or arc.
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BALLISTIC COEFFICIENT(B.C.):
The relationship to a bullet’s density, shape and weight expressed as a decimal number.
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BAROMETRIC PRESSURE
The measure of atmospheric pressure compared to an ideal or norm.
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BEARING SURFACE
The surface of a machine part that bears the friction or weight caused by some mechanical force. On a rifle this is used to refer to Glossary - 2the bolt lugs that contact the receiver and hold the bolt closed against combustion pressures.
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BEDDING
The part of the rifle stock that comes in contact with the action or barrel.
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BILL OF RIGHTS
The first ten Amendments to the United States Constitution.
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BULL BARREL
rifle or pistol barrel that is not tapered but has the same diameter along its entire length.
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BULLET
The projectile component of a complete cartridge.
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BULLET DROP
The measurement of how far gravity will pull a bullet down when fired from a rifle barrel that is exactly parallel to the ground
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BULLET PATH
The measurement of the path a bullet takes once fired.
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BURN RATE
The rate at which gunpowder is burned during the ignition and propulsion of a bullet.
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CADAVERIC SPASM
The momentary convulsion or spasm in which the suspect’s muscles tighten suddenly.
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CALIBER
The diameter of the lands in a rifle barrel or the diameter of a bullet expressed as a decimal fraction of an inch
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CALORIE
A unit of heat defined as that amount of heat required to raise the temperature of one gram of water by one degree Celsius
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CANNELURE
The crimping groove around a bullet
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CARTRIDGE
A complete and unfired round of ammunition including all the components
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CHAMBER
The cavity within the receiver that contains the cartridge that is ready to fire
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CHARGE
The gun powder contained within the case.
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CIVIL RIGHT
A term generally applied to those rights protected under the U.S. Constitution and particularly under the Bill of Rights
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CLEANSING BREATHS
Cleansing breaths are those deep deliberate breaths taken in succession intended to temporarily enrich the blood with additional oxygen.
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COCHLEA
A spiraled shaped organ in the inner ear that converts sound vibrations into the nerve impulses sent to the brain.
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COLD BARREL ZERO
Setting up and sighting a rifle so that its CCB shot is as accurate as possible.
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CROSSWIND
A breeze or wind that blows across the path of a projectile causing a sideways drift to the projectile’s path.
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CROWN
The departure end of the barrel, it is setback from the very end of the barrel and slopes into the lip of the bore.
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DEADLY FORCE
A threat of force, or use of force, of such magnitude that it is likely to cause death or a serious physical injury if inflicted on another.
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DECIBEL
A unit for measuring the loudness of a sound. Pain starts at 140 decibels for humans
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DENSITY ALTITUDE
is a function of elevation, temperature and barometric pressure.
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DROP:
The effect of gravity on a bullet as the bullet is pulled down.
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ENERGY
In physics energy is the capacity to do work.
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EXTERNAL BALLISTICS
The study of projectile behavior from the time it exits the firearm’s muzzle until it impacts the target.
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FOCAL LENGTH
The distance from the point of focus to the center of a lense.
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GLASS BEDDING
A process of using an epoxy to create an exactly fitting seat or bed between the rifle receiver and the rifle stock.
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GRAIN
A unit of weight measurement. One pound equals 7,000 grains. One ounce equals 437.5grains.
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HEAD SPACE
The point of contact between the cartridge and the chamber that sets the forward limit of the cartridge’s insertion
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HYDROSTATICS
A branch of the study of hydraulics that concerns the characteristics of static or stationary fluids.
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HYDROSTATIC SHOCK
The effects of a projectile against a static fluid.
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INFRARED
Electromagnetic energy (light) in that spectrum of energy between visible light and microwaves. Heat is a form of infrared radiation.
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INTERIOR BALLISTICS
The study of ballistics concerning a bullet’s travel while still contained within the firearm.
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LOCKING LUGS
The lugs or protrusions of a rifle bolt that engage the recesses inside the receiver to hold the bolt tightly closed against the receiver during firing.
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LONGITUDINAL AXIS
The imaginary line that passes through the tip of a bullet and continues out through the center of its base. It is around this axis that a bullet spins while in flight
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MACH
Mach refers to a unit of speed measurement related to the speed of sound
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MASS
The amount of matter a body or object contains. Weight is the interaction of mass and the force of gravity.
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MIL (Milliradian):
An angle measurement, not unlike a minute-of-angle, that equals 1/6400 of a circle. One mil equals 3.375 minutes.
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MINUTE-OF-ANGLE (MOA):
One minute-of angle(MOA) is a very narrow angle equal to one sixtieth of a degree.
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PILLAR BEDDING
A method to mate a rifle receiver to a rifle stock using metal sleeves imbedded in the stock through which the receiver bolts pass. These sleeves bear the pressure of the receiver bolts.
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PRECESS
The corkscrew motion of the longitudinal axis of a spinning object caused by the effects of torque on the spinning object.
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PYTHAGOREAN THEOREM
establishes the relationship of the sides of a right triangle. It is expressed as the square or the hypotenuse is equal to the sum of the squares of the other two sides.
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RECOIL LUG
A solid protrusion below a rifle receiver at the beginning of the barrel designed to transfer some of the recoil energy from the receiver to a reinforced area in the stock channel.
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RELATIVE HUMIDITY
The ratio of the quantity of water vapor actually present in the air compared to the maximum amount of water vapor the air can hold at a given temperature.
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SECTIONAL DENSITY
The weight of a bullet, in pounds, divided by the square of the bullet’s diameter, in inches.
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SINE
The ratio of the long side (hypotenuse) of aright triangle to the side opposite a particular corner or angle.
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SPEED OF LIGHT
Light travels at 186,000 miles per second through a vacuum or space
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TRANS-SONIC:
Trans-sonic speeds are in the rangeof Mach 0.9 to 1.1 (1,000-1,200 fps).
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