Precision Marksmanship

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gruntaz
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298343
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Precision Marksmanship
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2015-03-13 16:40:19
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Precision Marksmanship
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Precision Marksmanship
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  1. ACTION
    The part of a firearm that accepts a live cartridge, fires it, and ejects it.
  2. ANGLE OF INCIDENCE
    The angle at which an object strikes a surface
  3. APEX
    The top most point of a cone, triangle or arc.
  4. BALLISTIC COEFFICIENT(B.C.):
    The relationship to a bullet’s density, shape and weight expressed as a decimal number.
  5. BAROMETRIC PRESSURE
    The measure of atmospheric pressure compared to an ideal or norm.
  6. 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.
  7. BEDDING
    The part of the rifle stock that comes in contact with the action or barrel.
  8. BILL OF RIGHTS
    The first ten Amendments to the United States Constitution.
  9. BULL BARREL
    rifle or pistol barrel that is not tapered but has the same diameter along its entire length.
  10. BULLET
    The projectile component of a complete cartridge.
  11. 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
  12. BULLET PATH
    The measurement of the path a bullet takes once fired.
  13. BURN RATE
    The rate at which gunpowder is burned during the ignition and propulsion of a bullet.
  14. CADAVERIC SPASM
    The momentary convulsion or spasm in which the suspect’s muscles tighten suddenly.
  15. CALIBER
    The diameter of the lands in a rifle barrel or the diameter of a bullet expressed as a decimal fraction of an inch
  16. 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
  17. CANNELURE
    The crimping groove around a bullet
  18. CARTRIDGE
    A complete and unfired round of ammunition including all the components
  19. CHAMBER
    The cavity within the receiver that contains the cartridge that is ready to fire
  20. CHARGE
    The gun powder contained within the case.
  21. CIVIL RIGHT
    A term generally applied to those rights protected under the U.S. Constitution and particularly under the Bill of Rights
  22. CLEANSING BREATHS
    Cleansing breaths are those deep deliberate breaths taken in succession intended to temporarily enrich the blood with additional oxygen.
  23. COCHLEA
    A spiraled shaped organ in the inner ear that converts sound vibrations into the nerve impulses sent to the brain.
  24. COLD BARREL ZERO
    Setting up and sighting a rifle so that its CCB shot is as accurate as possible.
  25. CROSSWIND
    A breeze or wind that blows across the path of a projectile causing a sideways drift to the projectile’s path.
  26. 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.
  27. 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.
  28. DECIBEL
    A unit for measuring the loudness of a sound. Pain starts at 140 decibels for humans
  29. DENSITY ALTITUDE
    is a function of elevation, temperature and barometric pressure.
  30. DROP:
    The effect of gravity on a bullet as the bullet is pulled down.
  31. ENERGY
    In physics energy is the capacity to do work.
  32. EXTERNAL BALLISTICS
    The study of projectile behavior from the time it exits the firearm’s muzzle until it impacts the target.
  33. FOCAL LENGTH
    The distance from the point of focus to the center of a lense.
  34. GLASS BEDDING
    A process of using an epoxy to create an exactly fitting seat or bed between the rifle receiver and the rifle stock.
  35. GRAIN
    A unit of weight measurement. One pound equals 7,000 grains. One ounce equals 437.5grains.
  36. HEAD SPACE
    The point of contact between the cartridge and the chamber that sets the forward limit of the cartridge’s insertion
  37. HYDROSTATICS
    A branch of the study of hydraulics that concerns the characteristics of static or stationary fluids.
  38. HYDROSTATIC SHOCK
    The effects of a projectile against a static fluid.
  39. INFRARED
    Electromagnetic energy (light) in that spectrum of energy between visible light and microwaves. Heat is a form of infrared radiation.
  40. INTERIOR BALLISTICS
    The study of ballistics concerning a bullet’s travel while still contained within the firearm.
  41. 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.
  42. 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
  43. MACH
    Mach refers to a unit of speed measurement related to the speed of sound
  44. MASS
    The amount of matter a body or object contains. Weight is the interaction of mass and the force of gravity.
  45. MIL (Milliradian):
    An angle measurement, not unlike a minute-of-angle, that equals 1/6400 of a circle. One mil equals 3.375 minutes.
  46. MINUTE-OF-ANGLE (MOA):
    One minute-of angle(MOA) is a very narrow angle equal to one sixtieth of a degree.
  47. 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.
  48. PRECESS
    The corkscrew motion of the longitudinal axis of a spinning object caused by the effects of torque on the spinning object.
  49. 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.
  50. 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.
  51. 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.
  52. SECTIONAL DENSITY
    The weight of a bullet, in pounds, divided by the square of the bullet’s diameter, in inches.
  53. SINE
    The ratio of the long side (hypotenuse) of aright triangle to the side opposite a particular corner or angle.
  54. SPEED OF LIGHT
    Light travels at 186,000 miles per second through a vacuum or space
  55. TRANS-SONIC:
    Trans-sonic speeds are in the rangeof Mach 0.9 to 1.1 (1,000-1,200 fps).

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