.300 Weatherby Magnum

.300 Weatherby Magnum

Infobox Firearm Cartridge
name= .300 Weatherby Magnum


caption= .300 Weatherby cartridge
origin= USA
type= Rifle
service=
used_by=
wars=
designer= Roy Weatherby
design_date=1944
manufacturer=Weatherby
production_date=1944
number=
variants=
is_SI_specs=
parent=.300 H&H Magnum
case_type=Belted, bottleneck
bullet=.308
neck=.336
shoulder=.492
base=.512
rim_dia=.531
rim_thick=
case_length=2.825
length=3.562
rifling=1-10
primer=Large rifle magnum
is_SI_ballistics=
bw1=150
btype1=SP
vel1=3540
en1=4173
bw2=165
btype2=SP
vel2=3390
en2=4210
bw3=180
btype3=BST
vel3=3250
en3=4223
bw4=200
btype4=Partition
vel4=3060
en4=4158
bw5=220
btype5=Rn-Ex
vel5=2845
en5=3954
test_barrel_length=26
balsrc= Weatherby [http://www.weatherby.com/products/ammo.asp?prd_id=6 .300 Weatherby Magnum page at Weatherby] ]
The .300 Weatherby Magnum is a .30 caliber rifle cartridge created by Roy Weatherby in 1944 and produced by Weatherby. It has become the most popular of all the Weatherby cartridges.

Background

Roy Weatherby already had experience with other custom cartridges such as his own .270 Weatherby Magnum when he created the .300 Wby. Like most of his other magnum cartridges, this is based on a blown-out .300 H&H Magnum case, using the signature Weatherby double-radius shoulder.

Performance

Weatherby claims that this is the most powerful .30 caliber magnum rifle commercially available, but the recently introduced .300 RUM is now more powerful. Of course there are quite a few very large .30 caliber wildcats around, not to mention Weatherby's own .30-378 Weatherby Magnum.

One must note however when comparing the .300 RUM and the .300 Weatherby Magnum the difference in factory loadings. Performance data is often listed on the side of the ammunition box for those who wish to do an in-store comparison. On average the Weatherby cartridge is listed with higher performance. This is because from the factory Weatherby loads its rounds with a greater powder charge than does Remington. This is because Remington generally sells rounds below the cartridges maximum performance envelope so that its recoil will be more forgiving to shooters. In order to take advantage of the greater case capacity of the non-belted Remington round one must handload it to a greater powder charge.

The .300 Wby is in common use by big-game hunters all over the world. [ [http://www.chuckhawks.com/subscribers/rifle_cartridge_page/300Wby.htm .300 Weatherby by Chuck Hawks (subscription required)] ]

ee also

* List of rifle cartridges
* 7 mm caliber other cartridges in the same caliber range

References


* [http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/308Cal(7.82mm)/300%20Weatherby%20Magnum%20pages%20279%20and%20280.pdf .300 Weatherby Magnum at Accurate Powder] Cartridge dimensions.


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