Script error
.300 Remington American Magnum(7.62 x 65.5mm)
Type Rifle
Place of origin USA
Production history
Designer Aleksandr Kolesnikov
Designed Feb 2010
Manufacturer Remington-derived Wildcat
Variants 3
Parent case .404 Jeffery
Case type Rimless, bottleneck
Bullet diameter .308 in (Bad rounding hereScript error mm)
Neck diameter .344 in (Bad rounding hereScript error mm)
Shoulder diameter .525 in (Bad rounding hereScript error mm)
Base diameter .550 in (Bad rounding hereScript error mm)
Rim diameter .535 in (Bad rounding hereScript error mm)
Rim thickness .050 in (Bad rounding hereScript error mm)
Case length 2.580 in (Bad rounding hereScript error mm)
Overall length 3.340 in (Bad rounding hereScript error mm)
Case capacity 105 gr H2O (6.825 cm³)
Rifling twist 1-10"
Primer type Large rifle magnum
Maximum pressure 65,000 psi (Bad rounding hereScript error MPa)
Ballistic performance
Bullet weight/type Velocity Energy
180 gr (Bad rounding hereScript error g) X3,056 ft/s (Bad rounding hereScript error m/s)3,979 ft·lbf (Bad rounding hereScript error J)
Test barrel length: 26" (660 mm)

The .300, .338, .375 family of Remington American Magnums was designed by Aleksandr Kolesnikov of Houston, Texas, USA in February 2010. This was a response to the .375 Ruger. It is based upon the .300 RUM case, shortened to 2.580" to fit into Standard length Remington 700 action (firearm), while maximizing powder capacity by using .550" case diameter instead of Ruger's .532".

The RAM case family provides nearly the same performance as the RUM while generating less recoil and using less costly "standard" model 700 actions, rather than more expensive "magnum" actions. This offers a power level between the RUM and WSM cases, while employing sturdy, accurate, plentiful, relatively inexpensive 700 actions.


In 1999 Remington jumped on the current high performance bandwagon by creating their own beltless magnum. The .300 RUM was the first in a family of new Ultra magnum cartridges[1] based on the .404 Jeffery, later joined by the 7 mm RUM, .338 RUM, and .375 RUM. In addition, Remington later created a shortened version called the Remington Short Action Ultra Magnums to compete with Winchester's line of Winchester Short Magnums.

Essentially a variant of the .375 Dakota, Aleksandr Kolesnikov named the .300 RAM in homage to the Remington Corporation. It is based on the .300 RUM shortened to fit in Remington 700-series Standard length actions. The acronym "RAM" is to specify that it is intended to be capable of taking any North or South American Game animals. Additionally, "RAM" alludes to the speeds attained by Ramjet aircraft engines.

The .300 RAM series cases utilize a larger case diameter than .375 Ruger based cartridge, while still fitting in Standard length Remington 700 action (firearm).

Because the .300 RAM is beltless, it headspaces on the shoulder giving it a potential edge in accuracy over belted magnums, in addition to longer case life. The rebated rim allows this cartridge to be used in an action with a magnum bolt faces (.535 inches).


.300 Magnum performance comparisons
Cartridge Bullet Weight Muzzle velocity Muzzle energy
.300 RSAUM 200 2790 3458
.300 WSM 200 2822 3538
.300 Win Mag 200 2822 3538
7.62 Jonson 200 2935 3826
.300 Wby Mag 200 2987 3963
.300 RUM 200 3154 4419
.30-378 Wby Mag 200 3160 4434
.300 Lapua Magnum 200 3200 4585

See alsoEdit


  1. 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.