Performance
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 weighting 210 gr (14 g) to 235 gr (15.2 g) are suitable for lighter plains game. Bullets weighting between 250 gr (16 g) to 285 gr (18.5 g) can be used on heavy bodied plains game. Bullets weighting 285 gr (18.5 g) to 300 gr (19 g) should be reserved for heavy dangerous game.
Today, a typical factory load such as Remington’s R375M1 or Federal’s ammunition will launch a 270 gr (17 g) spitzer bullet at 2,690 feet per second (820 m/s) with 4,337 ft·lbf (5,880 J) of energy at the muzzle. This load has approximately the same trajectory as the 180-grain (12 g) bullet from a .30-06 Springfield. However while the .30-06 generates only about 2,914 ft·lbf (3,951 J) compared with the .375 H&H. The 270 gr (17 g) spitzer bullet at .375 H&H velocities has a maximum point black range (MPBR) of about 260 yd (240 m) when sighted in at about 220 yd (200 m).
The typical 300 gr (19 g) ammunition manufactured by Federal and Remington have a muzzle velocity of 2,530 feet per second (770 m/s) churning out 4,263 ft·lbf (5,780 J) of energy. The 300 gr (19 g) ammunition has a bullet trajectory similar to that of the .308 Winchester firing a 180 gr (12 g) bullet. The trajectory allows for a MPBR of about 245 yd (224 m) when zeroed in for 210 yd (190 m).
Scant attention is paid today to bullets in the 225–235 gr (14.6–15.2 g) weight range. At present no mainstream ammunition manufacturer produces ammunition loaded with these bullets. However these bullets are available for those wishing to handload. Bullets in this weight range can be launched at velocities of 2,800–2,900 ft/s (850–880 m/s).
Hornady new Superformance line of cartridges provides a leap in performance to the .375 H&H cartridge. The Superformance line uses powders specifically blended for each cartridge. Hornady’s 375 H&H 270 gr SP-RP Superformance ammunition fires a 270 gr (17 g) bullet at 2,800 ft/s (850 m/s) for while the 375 H&H 300 gr DGS Superformance fires a 300 gr (19 g) bullet at 2,670 ft/s (810 m/s) generating 4,699 ft·lbf (6,371 J) and 4,748 ft·lbf (6,437 J) of energy respectively.
The 9.3x64mm Brenneke cartridge is probably the closest European continental ballistic twin of the .375 Holland & Holland Magnum. When compared to the .375 Holland & Holland Magnum the 9.3x64mm Brenneke uses a bullet of a slightly smaller diameter of .366 in (9.3 mm) versus the .375 H&H which uses a .375 in (9.5 mm) bullet a difference of only .009 in (0.23 mm).
Read more about this topic: .375 Holland & Holland Magnum
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