.375 Ruger

.375 Ruger (9.5×65.5mm)

Type

Rifle

Place of origin

USA

Production history

Designer

Ruger

Designed

2007

Specifications

Parent case

Unique

Case type

Rimless, bottleneck

Bullet diameter

.375 in (9.5 mm)

Neck diameter

.405 in (10.3 mm)

Shoulder diameter

.515 in (13.1 mm)

Base diameter

.532 in (13.5 mm)

Rim diameter

.532 in (13.5 mm)

Rim thickness

.050 in (1.3 mm)

Case length

2.580 in (65.5 mm)

Overall length

3.340 in (84.8 mm)

Case capacity

99 gr H₂O (6.4 cm³)

Rifling twist

1-12" (304.8 mm)

Primer type

Large rifle

Maximum pressure

62,000 psi (430 MPa)

Ballistic performance

Bullet mass/type	Velocity	Energy
270 gr (17 g) SP	2,840 ft/s (870 m/s)	4,835 ft·lbf (6,555 J)
300 gr (19 g) DGS	2,660 ft/s (810 m/s)	4,713 ft·lbf (6,390 J)
300 gr (19 g) DGX	2,660 ft/s (810 m/s)	4,713 ft·lbf (6,390 J)

Test barrel length: 23
Source(s): Hornady

The .375 Ruger (9.5×65.5mm) is a rimless, standard-length rifle cartridge designed for the hunting of large dangerous game. It is designed to provide an increase in performance over the .375 H&H cartridge, yet to be chambered in a standard length action rifle. The cartridge was designed by Hornady and Ruger in partnership and released commercially in 2007 and chambered in the Ruger Hawkeye African and the Ruger Hawkeye Alaskan rifles.

The .375 Ruger uses a unique case designed by Hornady and Ruger. The case is of a rimless design having the base and rim diameter of .532 in (13.5 mm) which is the same diameter of the belt on belted magnum cases based on the .300 H&H Magnum and .375 H&H Magnum. This allows the cartridge to have a greater case capacity than a belted magnum case given cases of equal length. As Ruger intended the cartridge to be chambered in standard length bolt-action rifles the case length was kept to 2.580 in (65.5 mm) which is only .04 in (1.0 mm) longer than the .270 Winchester case. The maximum overall length of the cartridge is 3.340 in (84.8 mm) which is similar to the maximum overall length to standard length cartridges such as the .338 Winchester Magnum or the .30-06 Springfield. Unlike Remington Ultra Magnum cartridges, the Ruger Magnums can be chambered in standard length bolt-action rifles. This allowed Ruger to chamber the cartridge without extensively redesigning their M77 rifle to adopt them to the new Ruger cartridge.

While the .375 H&H Magnum is longer than the .375 Ruger, the latter cartridge has a greater case capacity than the Holland & Holland cartridge. This is due to the .375 H&H Magnum having a long tapered body while the .375 Ruger follows modern cartridge designs in that it has very little taper and a sharper shoulder. The case capacity of the .375 Ruger is 99.0 gr. of water (6.43 cm³) while the .375 H&H Magnum has a case capacity of 95.3 gr. of water (6.19 cm³), an increase of 4%.

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Wikipedia