7mm Remington Ultra Magnum

7mm Remington Ultra Magnum
Type	Rifle
Place of origin	USA
Production history
Designer	Remington
Designed	2002
Specifications
Parent case	.300 Remington Ultra Magnum
Case type	Beltless, rebated, bottleneck
Bullet diameter	.284 in (7.2 mm)
Neck diameter	.317 in (8.1 mm)
Shoulder diameter	.5250 in (13.34 mm)
Base diameter	.5500 in (13.97 mm)
Rim diameter	.532 in (13.5 mm)
Case length	2.850 in (72.4 mm)
Overall length	3.600 in (91.4 mm)
Rifling twist	1-9 1/4"
Primer type	Large rifle magnum
Ballistic performance
Bullet mass/type Velocity Energy 140 gr (9 g) PSP Bonded 3,425 ft/s (1,044 m/s) 3,646 ft⋅lbf (4,943 J) 150 gr (10 g) PSP Bonded 3,325 ft/s (1,013 m/s) 3,682 ft⋅lbf (4,992 J) 175 gr (11 g) PSP A-Frame 3,025 ft/s (922 m/s) 3,555 ft⋅lbf (4,820 J)
Test barrel length: 26"

The 7mm Remington Ultra Magnum is a 7mm rifle cartridge introduced by Remington Arms in 2001. By using the 404 Jeffery Remington case they developed the .300RUM, .338RUM and the 7mm RUM. By necking down the .300 RUM to suit the .284 or 7mm projectile, Remington produced a non-belted case with a head diameter that is somewhat larger than belt diameter of original belted numbers. Remington managed to introduce a case that has significantly more capacity than any conventional belted magnum. It is in a different class from any previous mainstream factory offering. This is a fantastic longrange cartridge when handloaded with quality projectiles such as the 168grn/180grn Berger VLD. Shooting the 168grn VLD in front of 94grns of Hodgdon Retumbo velocity is around 3250 fps and has 3932 ft-lbs of energy (this load achieves 1/2moa in my rifle). Compared to the 7mm Remington Magnum, top 7mm Ultra loads deliver 25% more energy at 300 yards. Such performance demands a price and in this case, that is a large muzzle blast, sharp recoil and short barrel life, regardless of how careful the owner is, with cleaning after each shooting session, and with significant cooling between shots during any given session. It is an open question as to how many hunters can use and, therefore, actually need this level of performance. For those few who do, this can be an impressive performer and is suitable for very long shots on all but the largest of species, worldwide. The longrange hunter should not be put off by the short barrel life as he will not be shooting as many rounds as the conventional hunter.

See also

• List of rifle cartridges
• 7 mm caliber