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((Short description|Rifle cartridge))
((Multiple issues|
((more citations needed|date=January 2013))
((Notability|Product|date=June 2022))
))

((Infobox firearm cartridge
| name = .300 Weatherby Magnum
| image = 300 Weatherby.jpg | image_size = 200px
| caption = .300 Weatherby cartridge
| origin = USA
| type = Rifle
<!-- Service history -->
| service = 
| used_by = 
| wars = 
<!-- Production history -->
| designer = Roy Weatherby
| design_date = 1944
| manufacturer = Weatherby
| production_date = 1944–present
| number = 
| variants = 
<!-- Specifications -->
| 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
| max_pressure = 65000
| max_cup = 
| filling = 
| filling_weight = 
| detonation = 
| yield = 
<!-- Ballistic performance -->
| 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 <ref name="300wby">[https://web.archive.org/web/20080517061230/http://www.weatherby.com/products/ammo.asp?prd_id=6 .300 Weatherby Magnum page at Weatherby]</ref>
))

The '''.300 Weatherby Magnum''' is a [[7 mm caliber|.30]] [[caliber]] [[rifle]] [[Cartridge (firearms)|cartridge]] created by [[Roy Weatherby]] in 1944 and produced by [[Weatherby]]. It has become the most popular of all the Weatherby cartridges.<ref name="300wby" />

==Background==
Roy Weatherby already had experience with other custom cartridges such as his own [[.270 Weatherby Magnum]] when he created the .300 Weatherby. 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. The Weatherby was first introduced in 1944, and the [[.300 Winchester Magnum]] was introduced in 1963.<ref>((cite book|title= Speer Bullets Reloading Manual #14 |pages=525|first=Speer |last=Bullets |publisher =Speer|year=2009 |isbn= 978-0-9791860-0-4))</ref>

In recent years, Remington, Winchester and Ruger have produced rifles in this caliber, and most major ammunition manufacturers now supply factory loads.<ref>((cite book|title= Speer Bullets Reloading Manual #14 |pages=540|first=Speer |last=Bullets |publisher =Speer|year=2009 |isbn= 978-0-9791860-0-4))</ref>

==Performance==
Historically, Weatherby claimed that this is the most powerful .30 caliber magnum rifle commercially available, but the recently introduced [[.300 Remington Ultra Magnum]], the [[.300 Norma Magnum]] and Weatherby's own [[.30-378 Weatherby Magnum]] are now more powerful. Of course there are quite a few very large .30 caliber [[wildcat cartridge]]s.

When comparing the .300 RUM and the .300 Weatherby Magnum, however, there is a 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, Weatherby factory ammo is loaded to higher chamber pressures than Remington or Winchester magnum rounds. The Remington round can be handloaded to equal pressures, and as a consequence, surpass the .300 Weatherby in power.

The .300 Weatherby is commonly used by [[big-game hunter]]s all over the world.<ref>[http://www.chuckhawks.com/subscribers/rifle_cartridge_page/300Wby.htm .300 Weatherby by Chuck Hawks (subscription required)]((subscription required))</ref>

==See also==
* [[List of rifle cartridges]]
* [[7 mm caliber]] other cartridges in the same caliber range
* [[Table of handgun and rifle cartridges]]

==References==
((reflist))
((refbegin))
* [https://web.archive.org/web/20100827223042/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.
((refend))

((Weatherby Cartridges Firearms))

((DEFAULTSORT:300 Weatherby Magnum))
[[Category:Pistol and rifle cartridges]]
[[Category:Magnum rifle cartridges]]
[[Category:Weatherby Magnum rifle cartridges]]

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