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  2. .177 caliber - Wikipedia

    en.wikipedia.org/wiki/.177_caliber

    Match, Magnum, Hunter, Ball, Hollow Point, Pointed. .177 caliber or 4.5 mm caliber is the smallest diameter of pellets and BB shots widely used in air guns, and is the only caliber generally accepted for formal target competition. It is also sometimes used for hunting small game, like fowl. It is also used in field target competitions, where it ...

  3. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The Charrière is measured by the ''outer'' diameter, and is defined as 1 Fr = 1/3 mm, and thus 1 mm = 3 Fr; therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3. [2] The French units roughly correspond to the outer circumference of the catheter (see table below).

  4. BB gun - Wikipedia

    en.wikipedia.org/wiki/BB_gun

    BB pistol with CO 2 cartridges and BBs. A BB gun is a type of air gun designed to shoot metallic spherical projectiles called BBs (not to be confused with similar-looking bearing balls), which are approximately the same size as BB-size lead birdshot used in shotguns (0.180 in or 4.6 mm in diameter). Modern BB guns usually have a smoothbore ...

  5. Caliber - Wikipedia

    en.wikipedia.org/wiki/Caliber

    The .308 Winchester is measured across the grooves and uses a .308-in diameter (7.82-mm) bullet; the military-specification version is known as 7.62 × 51 mm NATO, so called because the bore diameter measured between the lands is 7.62 mm, and the cartridge has a case 51 mm long.

  6. Traditional point-size names - Wikipedia

    en.wikipedia.org/wiki/Traditional_point-size_names

    Point Metric size American system Continental system Chinese system American [4] British [1] French [5] German [6] Dutch Character Pinyin Meaning 1 ≈ 0.353 mm: American [a] ...

  7. M8 (rocket) - Wikipedia

    en.wikipedia.org/wiki/M8_(rocket)

    M8 rockets being launched from a "Calliope" multiple launcher mounted on a Sherman tank. The M8 was a 4.5-inch (114 mm) rocket developed and used by the United States military during World War II. Produced in the millions, it was fired from both air- and ground-based launchers; it was replaced by the M16 rocket in 1945.

  8. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    The centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10−2 metres (⁠ 1 100 ⁠ m = 0.01 m). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimetres. 1 cm – 0.39 inches. 1 cm – edge of a square of area 1 cm 2.

  9. 4.5-inch Mark 8 naval gun - Wikipedia

    en.wikipedia.org/wiki/4.5-inch_Mark_8_naval_gun

    Fixed QF 46 pounds (21 kg) HE. Calibre. 4.45-inch (113 mm) [1] Rate of fire. 25 rounds per minute automatic. Maximum firing range. 27.5 kilometres (17.1 mi) [2] The 4.5 inch Mark 8 is a British naval gun system which currently equips the Royal Navy's destroyers and frigates, and some British destroyers and frigates sold to other countries.