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  2. Shot grouping - Wikipedia

    en.wikipedia.org/wiki/Shot_grouping

    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.

  3. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    Mildot chart as used by snipers. Angle can be used for either calculating target size or range if one of them is known. Where the range is known the angle will give the size, where the size is known then the range is given. When out in the field angle can be measured approximately by using calibrated optics or roughly using one's fingers and hands.

  4. Terminal ballistics - Wikipedia

    en.wikipedia.org/wiki/Terminal_ballistics

    Bullet parts: 1 metal jacket, 2 lead core, 3 steel penetrator. Terminal ballistics is a sub-field of ballistics concerned with the behavior and effects of a projectile when it hits and transfers its energy to a target. Bullet design (as well as the velocity of impact) largely determines the effectiveness of penetration. [1]

  5. Ballistic coefficient - Wikipedia

    en.wikipedia.org/wiki/Ballistic_coefficient

    The test results were obtained from many shots, not just a single shot. The bullet was assigned 1.062 lb/in 2 (746.7 kg/m 2) for its BC number by the bullet's manufacturer, Lost River Ballistic Technologies, before it went out of business. Measurements on other bullets can give totally different results.

  6. Rifleman's rule - Wikipedia

    en.wikipedia.org/wiki/Rifleman's_rule

    The bore angle is set to ensure that a bullet on a parabolic trajectory will intersect the LOS to the target at a specific range. A properly adjusted rifle barrel and sight are said to be "zeroed." Figure 3 illustrates how the LOS, bullet trajectory, and range ( R H {\displaystyle R_{H}} ) are related.

  7. Ballistic table - Wikipedia

    en.wikipedia.org/wiki/Ballistic_table

    Example of a ballistic table for a given 7.62×51mm NATO load. Bullet drop and wind drift are shown both in mrad and MOA.. A ballistic table or ballistic chart, also known as the data of previous engagements (DOPE) chart, is a reference data chart used in long-range shooting to predict the trajectory of a projectile and compensate for physical effects of gravity and wind drift, in order to ...

  8. External ballistics - Wikipedia

    en.wikipedia.org/wiki/External_ballistics

    Sectional density is a very important aspect of a projectile or bullet, and is for a round projectile like a bullet the ratio of frontal surface area (half the bullet diameter squared, times pi) to bullet mass. Since, for a given bullet shape, frontal surface increases as the square of the calibre, and mass increases as the cube of the diameter ...

  9. Miller twist rule - Wikipedia

    en.wikipedia.org/wiki/Miller_twist_rule

    Miller twist rule is a mathematical formula derived by American physical chemist and historian of science Donald G. Miller (1927-2012) to determine the rate of twist to apply to a given bullet to provide optimum stability using a rifled barrel. [1]

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