7mm Remington Ultra Magnum
Type Rifle
Place of origin USA
Production history
Designer Remington
Designed 2002
Parent case .300 Remington Ultra Magnum
Case type Beltless, rebated, bottleneck
Bullet diameter .284 in (Bad rounding hereScript error mm)
Neck diameter .317 in (Bad rounding hereScript error mm)
Shoulder diameter .5250 in (Bad rounding hereScript error mm)
Base diameter .5500 in (Bad rounding hereScript error mm)
Rim diameter .532 in (Bad rounding hereScript error mm)
Case length 2.850 in (Bad rounding hereScript error mm)
Overall length 3.600 in (Bad rounding hereScript error mm)
Rifling twist 1-9 1/4"
Primer type Large rifle magnum
Ballistic performance
Bullet weight/type Velocity Energy
140 gr (Bad rounding hereScript error g) PSP Bonded3,425 ft/s (Bad rounding hereScript error m/s)3,646 ft·lbf (Bad rounding hereScript error J)
150 gr (Bad rounding hereScript error g) PSP Bonded3,325 ft/s (Bad rounding hereScript error m/s)3,682 ft·lbf (Bad rounding hereScript error J)
175 gr (Bad rounding hereScript error g) PSP A-Frame3,025 ft/s (Bad rounding hereScript error m/s)3,555 ft·lbf (Bad rounding hereScript error J)
Test barrel length: 26"

The 7mm Remington Ultra Magnum or 7mm RUM is a 7mm rifle cartridge introduced by Remington Arms in 2001.


The 7mm RUM was created using the .404 Jeffery case which was also used to develop the .375 RUM .300 RUM, and .338 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. The resulting case has significantly more capacity than any conventional belted magnum. Compared to the 7mm Remington Magnum, top 7mm RUM loads deliver 25% more energy at 300 yards.Script error[citation needed] Such performance demands a price and in this case, that is a large muzzle blast, sharp recoil and short barrel life.Script error[citation needed]

The 7mm Ultra Magnum boasts the largest case of any commercial 7mm cartridge.

See alsoEdit


Script error

Script error

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.