The .375 H&H Magnum

By Chuck Hawks

.375 H&H Mag.
Illustration courtesy of Hornady Mfg. Co.

The big .375 Holland & Holland Magnum is the original belted magnum cartridge, and probably the best known of the medium bore cartridges. No other medium bore cartridge for big and dangerous game has such a sterling reputation worldwide.

The .375 not only has the punch for heavy and dangerous game, it shoots flat enough to make it useful for large plains game. Factory loads launch the popular 270 grain spitzer bullet (SD .274), at a muzzle velocity (MV) of 2,690 fps and a muzzle energy (ME) of 4,337 ft. lbs. Remaining energy at 200 yards is 2,234 ft. lbs. This load has about the same trajectory as the 180 grain bullet in a .30-06.

The .375 is most commonly reloaded with bullets ranging from 270-300 grains. For these bullets H414, H4350, IMR 4350, and AA 4350 are all good powder choices.

Here are some specifications of interest to reloaders: bullet diameter .375", maximum COL 3.600", maximum case length 2.850", trim to 2.840", MAP 62,000 psi.

Probably the most popular all-around bullet is the 270 grain spitzer. According to the Speer Relaoding Manual Number 13 their boat-tail spitzer bullet (BC .429) can be driven to a MV of 2611 fps by 76.0 grains of H4350 powder, and 2731 fps by a maximum load of 80.0 grains of H4350.

With the 300 grain Speer African Grand Slam Tungsten Solid bullet, 78.0 grains of VIHT N-160 powder can achieve a MV of 2491 fps. A maximum load of 82.0 grains of VIHT N-160 gives a MV of 2589 fps. These Speer loads used Winchester brass and CCI 250 primers, and were chronographed in a 24" rifle barrel.

Note: A full length article about the .375 H&H Magnum can be found on the Rifle Cartridge Page.

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Copyright 2004, 2013 by Chuck Hawks. All rights reserved.