.375 Remington Ultra Magnum

The .375 Remington Ultra Magnum, also known as the .375 RUM is a .375 rifle cartridge introduced by Remington Arms in 2000. The cartridge is intended for large and dangerous game.^[1]

.375 Remington Ultra Magnum
Type	Rifle
Place of origin	United States
Production history
Designer	Remington
Designed	2000[1]
Specifications
Parent case	.300 Remington Ultra Magnum[1]
Case type	Beltless, rebated-rim, bottleneck
Bullet diameter	.375 in (9.5 mm)
Neck diameter	.4050[1]
Shoulder diameter	.5250 in (13.34 mm)
Base diameter	.5500 in (13.97 mm)
Rim diameter	.534[1]
Case length	2.850[1]
Overall length	3.600 in (91.4 mm)
Rifling twist	1-12"
Primer type	Large rifle magnum
Maximum pressure	65,000 psi (450 MPa)
Maximum CUP	< !-- Ballistic performance --> CUP
Ballistic performance
Bullet mass/type Velocity Energy 235 gr (15 g) SP 3,148 ft/s (960 m/s) 5,172 ft⋅lbf (7,012 J) 250 gr (16 g) SBT 3,036 ft/s (925 m/s) 5,118 ft⋅lbf (6,939 J) 260 gr (17 g) Partition 2,970 ft/s (910 m/s) 5,094 ft⋅lbf (6,907 J) 270 gr (17 g) SP 2,941 ft/s (896 m/s) 5,187 ft⋅lbf (7,033 J) 300 gr (19 g) RN 2,945 ft/s (898 m/s) 5,760 ft⋅lbf (7,810 J)
Test barrel length: 26 Source(s): Alliant Powder[2]

It is a beltless, rebated rim cartridge created by necking up the .300 Remington Ultra Magnum case to .375 caliber with no other changes.^[1] Factory loadings are less powerful than handloads for the cartridge. Remington factory loads produce 2,760 ft/s (840 m/s)^[3] with a 300 grain (19 g) bullet for 5,070 ft·lbf (6.88 kJ) of muzzle energy.

General information

The intended use of this cartridge includes hunting large, thick-skinned game.^[1] It is powerful enough to kill any land animal^[1] and, with its high velocity, can do so at fairly long ranges. Such performance comes at the price of a heavy recoil: in a sporting-weight rifle of ~8 lb (3.6 kg), this cartridge can produce a fierce 80 ft·lbf (108 J) of recoil (approximately 3.5 times that of a .30-06.)

There is a wide selection of .375 in (9.53 mm) bullets available^[1][3][4] that are suited to the high velocities of the .375 RUM, and boat tail bullets help to further extend the useful range.^{[citation needed]}

Currently, there are no production rifles in this chambering (Savage & Remington previously did so.) Remington,^[3] DoubleTap^[5] and Nosler^[4] are the only sources of factory ammunition. Loading dies and reloading data are readily available to the handloader. Double Tap loads to the specifications attributed to handloader limits.^{[citation needed]}

See also

• List of rifle cartridges
• 9 mm caliber other cartridges of similar size.
• Table of handgun and rifle cartridges