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  2. Physics of firearms - Wikipedia

    en.wikipedia.org/wiki/Physics_of_firearms

    According to Newtonian mechanics, if the gun and shooter are at rest initially, the force on the bullet will be equal to that on the gun-shooter. This is due to Newton's third law of motion (For every action, there is an equal and opposite reaction). Consider a system where the gun and shooter have a combined mass m g and the bullet has a mass m b.

  3. Miller twist rule - Wikipedia

    en.wikipedia.org/wiki/Miller_twist_rule

    A diagram of a .30-06 Springfield showing the bullet diameter (7.85 mm) and length (31.28 mm). The following formula is one recommended by Miller: [1] [dead link ‍] = (+) where m = bullet mass in grains (defined as 64.79891 milligrams) s = gyroscopic stability factor (dimensionless)

  4. Impact depth - Wikipedia

    en.wikipedia.org/wiki/Impact_depth

    If the impactor has pushed a mass equal to its own mass at this speed, its whole momentum has been transferred to the mass in front of it and the impactor will be stopped. For a cylindrical impactor, by the time it stops, it will have penetrated to a depth that is equal to its own length times its relative density with respect to the target ...

  5. Muzzle energy - Wikipedia

    en.wikipedia.org/wiki/Muzzle_energy

    This caused many existing toy gun products on the Chinese market (particularly airsoft) to become illegal overnight, as almost all airsoft guns shooting a standard 0.20 g (3.1 gr) 6 mm (0.24 in) pellet have a muzzle velocity over 76 m/s (250 ft/s), which translates to more than 0.58 J (0.43 ft⋅lbf) of muzzle energy, or 2.0536 J/cm 2 of "ratio ...

  6. Range of a projectile - Wikipedia

    en.wikipedia.org/wiki/Range_of_a_projectile

    [citation needed] Mass also becomes important, as a more massive projectile will have more kinetic energy, and will thus be less affected by air resistance. The distribution of mass within the projectile can also be important, as an unevenly weighted projectile may spin undesirably, causing irregularities in its trajectory due to the magnus effect.

  7. Gauge (firearms) - Wikipedia

    en.wikipedia.org/wiki/Gauge_(firearms)

    Therefore with a 12-gauge, it would take 12 balls of lead of the same size as the 12 gauge shotgun's inner bore diameter to weigh 1 pound (453.6 g). [5] The term is related to the measurement of cannons, which were also measured by the weight of their iron round shot; an eight-pounder would fire an 8-pound (3.6 kg) ball. Therefore, a 12 gauge ...

  8. Shot grouping - Wikipedia

    en.wikipedia.org/wiki/Shot_grouping

    In shooting sports, a shot grouping, or simply group, is the collective pattern of projectile impacts on a target from multiple consecutive shots taken in one shooting session. The tightness of the grouping (the proximity of all the shots to each other) is a measure of the precision of a weapon, and a measure of the shooter's consistency and skill.

  9. Accurizing - Wikipedia

    en.wikipedia.org/wiki/Accurizing

    Comparison of milliradian (mil) and minute of arc (moa).. Since adjusting the point of impact to match the point of aim is relatively simple with any type of adjustable sights, the primary goal of accurizing is to increase the precision of the firearm, which is generally measured by looking at the dispersion of a number of shots fired at the same point of aim.