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  2. .375 H&H Magnum - Wikipedia

    en.wikipedia.org/wiki/.375_H&H_Magnum

    The .375 H&H Magnum, also known as .375 Holland & Holland Magnum, is a medium-bore rifle cartridge introduced in 1912 by London based gunmaker Holland & Holland. The .375 H&H cartridge featured a belt to ensure the correct headspace, which otherwise might be unreliable, given the narrow shoulder of the cartridge case.

  3. .300 H&H Magnum - Wikipedia

    en.wikipedia.org/wiki/.300_H&H_Magnum

    The .300 H&H Magnum cartridge was introduced by the British company Holland & Holland as the Super-Thirty in June, 1925. [2] The case was belted like the .375 H&H Magnum, and is based on the same case, as also is the .244 H&H Magnum. The belt is for headspace as the cases' shoulders have a narrow slope rather than an actual shoulder.

  4. .338 Winchester Magnum - Wikipedia

    en.wikipedia.org/wiki/.338_Winchester_Magnum

    Test barrel length: 24. Source (s): Accurate Powder [1] The .338 Winchester Magnum is a .338 in (8.6 mm) caliber, belted, rimless, bottlenecked cartridge introduced in 1958 by Winchester Repeating Arms. It is based on the blown-out, shortened .375 H&H Magnum. [2] The .338 in (8.6 mm) is the caliber at which medium-bore cartridges are considered ...

  5. Gram - Wikipedia

    en.wikipedia.org/wiki/Gram

    Atomic mass units. 6.022 140 76 × 1023 Da. The gram (originally gramme; [ 1] SI unit symbol g) is a unit of mass in the International System of Units (SI) equal to one thousandth of a kilogram . Originally defined as of 1795 as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre [1 cm 3 ], and at ...

  6. Grain (unit) - Wikipedia

    en.wikipedia.org/wiki/Grain_(unit)

    A grain is a unit of measurement of mass, and in the troy weight, avoirdupois, and apothecaries' systems, equal to exactly 64.798 91 milligrams. It is nominally based upon the mass of a single ideal seed of a cereal. From the Bronze Age into the Renaissance, the average masses of wheat and barley grains were part of the legal definitions of ...

  7. .400 H&H Magnum - Wikipedia

    en.wikipedia.org/wiki/.400_H&H_Magnum

    2,375 ft/s (724 m/s) 5,009 ft⋅lbf (6,791 J) Test barrel length: 24. Source (s): Chuckhawks.com [1] The .400 H&H Magnum also known as .400 Holland & Holland Magnum is a belted rimless bottlenecked cartridge introduced by Holland & Holland. The cartridge was released together with the .465 H&H Magnum in 2003. It is based on the .375 H&H Magnum ...

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