.338 Remington Ultra Magnum

The .338 Remington Ultra Magnum is a .338 caliber rifle cartridge introduced by Remington Arms in 2002.

.338 Remington Ultra Magnum
Type	Rifle
Place of origin	USA
Production history
Designer	Remington
Designed	2000
Specifications
Parent case	.300 Remington Ultra Magnum
Case type	Beltless, rebated, bottleneck
Bullet diameter	.338 in (8.6 mm)
Neck diameter	.371 in (9.4 mm)
Shoulder diameter	.526 in (13.4 mm)
Base diameter	.550 in (14.0 mm)
Rim diameter	.534 in (13.6 mm)
Case length	2.760 in (70.1 mm)
Overall length	3.600 in (91.4 mm)
Case capacity	113 gr H2O (7.3 cm3)
Rifling twist	1-10 in (254 mm)
Primer type	Large rifle magnum
Maximum pressure	65,000
Ballistic performance
Bullet mass/type Velocity Energy 250 gr (16 g) PSP Bonded 2,860 ft/s (870 m/s) 4,540 ft⋅lbf (6,160 J) 250 gr (16 g) PSP A-Frame 2,860 ft/s (870 m/s) 4,540 ft⋅lbf (6,160 J)
Test barrel length: 26"

Design

It is a beltless, rebated rim cartridge based on the .300 Remington Ultra Magnum^[1] case shortened .090" and necked-up to accept a 0.338-inch (.338 caliber) bullet. The .338 Remington Ultra Magnum has a similar case capacity as the .338 Lapua Magnum^[2] and somewhat lower than that of the .338-378 Weatherby Magnum. It is one of the most powerful .338-caliber rounds in production.^[3]

See also

• List of rifle cartridges
• Table of handgun and rifle cartridges
• .338 Edge