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. The cartridge was designed to use cordite which was made in long strands – hence the tapered shape of the case, which, as a beneficial side effect also helped in smooth chambering and extraction from a rifle’s breech.
When the .375 H&H Magnum was released in 1912 it was loaded with three bullet weights: a 235 gr (15.2 g) at 2,800 ft/s (850 m/s), 270 gr (17 g) at 2,650 ft/s (810 m/s)and a 300 gr (19 g) at 2,500 ft/s (760 m/s). However, today, with the availability of a wide range of powders, velocities gains of 150–200 ft/s (46–61 m/s) can be realized. Acceptable bullet weights for the .375 H&H Magnum range from 200 gr (13 g) to 380 gr (25 g). The lighter bullets, those weighing 210 gr (14 g) to 235 gr (15.2 g) are suitable for lighter plains game. Bullets weighing between 250 gr (16 g) to 285 gr (18.5 g) can be used on heavy bodied plains game. Bullets weighing 285 gr (18.5 g) to 300 gr (19 g) should be reserved for heavy dangerous game.
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