.300 Remington Ultra Magnum

Infobox Firearm Cartridge
name= .300 Remington Ultra Magnum


caption= .300 RUM cartridge
origin= USA
type= Rifle
service=
used_by=
wars=
designer= Remington
design_date=1999
manufacturer=
production_date=
number=
variants=
is_SI_specs=
parent=.404 Jeffery
case_type=Rimless, bottleneck
bullet=.308
neck=.344
shoulder=.525
base=.550
rim_dia=.534
rim_thick=
case_length=2.850
length=3.600
rifling=1-10"
primer=Large rifle magnum
max_pressure=65000
max_cup=
is_SI_ballistics=
bw1=150
btype1=X
vel1=3456
en1=3979
bw2=168
btype2=BTHP
vel2=3326
en2=4128
bw3=180
btype3=BTSP
vel3=3256
en3=4238
bw4=200
btype4=SP
vel4=3119
en4=4321
bw5=220
btype5=RN
vel5=2970
en5=4310
test_barrel_length=24" (610 mm)
balsrc= Accurate Powder [http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/308Cal(7.82mm)/300%20RUM%20Remington%20Ultra%20Magnum%20pages%20272%20to%20275.pdf .300 RUM data at Accurate Powder] ] The .300 Remington Ultra Magnum, also known as the .300 Ultra Mag' or .300 RUM is a 7.62 mm (.308in.) calibre rifle cartridge , 7.62x72mm, or .30 caliber rifle cartridge introduced by Remington Arms in 1999. The .300 Remington Ultra Magnum is one of the largest commercially available .30 caliber magnums currently being produced. It is an original designed beltless, rebated rim cartridge, capable of handling most large North American game, as well as long-range shooting. The .300 Remington Ultra Magnum is second only to the .30-378 Weatherby Magnum in cartridge-case capacity.

History

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 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.

It is more efficient than the .30-378 Weatherby Magnum in that it can produce nearly as much energy and velocity with the use of roughly 10 percent less powder.

The cartridge produced significantly more energy in testing than the .300 Winchester Magnum and .300 Weatherby Magnum cartridges did. cite book | last = Barnes | first = Frank C. | editor = Skinner, Stan | title = Cartridges of the World | edition = 11th Edition | origyear = 1965 | year = 2006 | publisher = Gun Digest Books | location = Iola, WI, USA | pages = 68, 103 | isbn = 0-89689-297-2]

Because the .300 RUM 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 (.532 inches).

To further enhance the usability of guns chambered in this cartridge, Remington now offers three different power levels.Power level 1 cartridges are similar in performance to the .30-'06 and are offered in three different convert|150|gr|g|sing=on bullet selections. The power level 2 performs similar to the .300 Winchester Magnum and is offered in two different convert|180|gr|g|sing=on bullet selections. Finally, the power level three ammunition is offered in 150 to convert|200|gr|g|sing=on bullet selections. These bullets exit the muzzle at convert|3032|ft/s|m/s for the convert|200|gr|g|sing=on variety and the convert|150|gr|g|sing=on bullet is sent along at convert|3450|ft/s|m/s|abbr=on.

ee also

* List of rifle cartridges
* 7 mm caliber

References