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. It was the favorite medium bore cartridge of the late Jack O'Connor (Dean of American Gun Writers), the late Larry Brace (Custom gunmaker and co-founder of the Gunmaker's Guild) and our own David Tong (Guns and Shooting Online contributor).

The .375 not only has the punch for thick-skinned dangerous game with 300 grain bullets, it shoots flat enough to be useful for large plains game with 235-270 grain bullets. 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.