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375 H&H Ammo

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The .375 H&H Magnum, also known as .375 Holland & Holland Magnum (9.5×72mmB), is a medium-bore rifle cartridge. The cartridge was introduced in 1912 by London based gunmaker Holland & Holland.

The .375 H&H Magnum is the result of competition between British rifle manufacturers to develop new cartridges to take advantage of the new smokeless powders.

The .375 H&H often is cited as one of the most useful all-round rifle cartridges, especially in shooting big and dangerous games.

With bullet weights ranging from 270 grains (17 g) to 350 grains (23 g), it has the necessary punch for small to medium game, as well as massive, thick-skinned dangerous game.

The most common bullet weight available in this caliber is 300 grains (19 g). In many regions with thick-skinned dangerous game animals, the .375 H&H is seen as the minimum acceptable caliber. In many places (primarily in Africa), it is now the legal minimum for hunting such games.

About: .375 H&H Mag

  • Type: Rifle
  • Place of origin: United Kingdom
  • Designer: Holland & Holland
  • Designed: 1912
  • Produced: 1912–present
  • Variants: .375 H&H Ackley Improved, .375 Weatherby Magnum


  • Parent case: Unique
  • Bullet diameter: .376 in (9.6 mm)
  • Neck diameter : .402 in (10.2 mm)
  • Shoulder diameter: .448 in (11.4 mm)
  • Base diameter: .513 in (13.0 mm)
  • Rim diameter: .532 in (13.5 mm)
  • Rim thickness: .050 in (1.3 mm)
  • Case length: 2.850 in (72.4 mm)
  • Overall length: 3.600 in (91.4 mm)
  • Case capacity: 95.0 gr H2O (6.16 cm3)
  • Rifling twist: 1-12 in (305 mm)
  • Primer type: Large rifle magnum
  • Maximum pressure: 62,366 psi (430.00 MPa)

Ballistic performance

Bullet mass/type Velocity Energy
270 gr (17 g) Barnes TSX 2,625 ft/s (800 m/s) 4,132 ft⋅lbf (5,602 J)
300 gr (19 g) Norma Oryx 2,559 ft/s (780 m/s) 4,363 ft⋅lbf (5,915 J)
300 gr (19 g) Swift A-Frame 2,559 ft/s (780 m/s) 4,363 ft⋅lbf (5,915 J)
350 gr (23 g) Woodleigh FMJ 2,300 ft/s (700 m/s) 4,112 ft⋅lbf (5,575 J)
350 gr (23 g) Woodleigh Soft Nose 2,300 ft/s (700 m/s) 4,112 ft⋅lbf (5,575 J)

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