.375 Remington Ultra Magnum

.375 Remington Ultra Magnum
.375 Remington Ultra Magnum
Type	Rifle
Place of origin	United States
Production history
Designer	Remington
Designed	2000
Specifications
Parent case	.300 Remington Ultra Magnum
Case type	Beltless, rebated-rim, bottleneck
Bullet diameter	.375 in (9.5 mm)
Neck diameter	.4050
Shoulder diameter	.5250 in (13.34 mm)
Base diameter	.5500 in (13.97 mm)
Rim diameter	.534
Case length	2.850
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
	Test barrel length: 26; Source(s): Alliant Powder

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]

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.

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.

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j "375 Remington Ultra Mag" (PDF). Barnes Bullets. Barnes Bullets, LLC. 38 N Frontage Rd Mona, UT 84645. Archived from the original (PDF) on 2014-08-11. Retrieved 2014-07-26.
^ "Alliant Powder - Reloaders' Guide". Alliant Powder. Alliant Powder 2299 Snake River Avenue Lewiston, ID 83501. 2014.
^ ^a ^b ^c "PREMIER A-FRAME". Remington. Remington Arms Company, LLC 870 Remington Drive P.O. Box 700 Madison, NC 27025-0700. 2014. Archived from the original on 2014-07-26. Retrieved 2014-07-23.
^ ^a ^b "Ammunition-Nosler". Nosler. Nosler Inc. 107 SW Columbia St. Bend, OR 97702. 2014. Archived from the original on 2014-07-16. Retrieved 2014-07-24.
^ "375 Remington Ultra Mag". DoubleTap Ammunition. DoubleTap Ammunition 646 S. Main St. #333 Cedar City, UT 84720. 2014. Retrieved 2014-07-24.