.240 Weatherby Magnum

.240 Weatherby Magnum

Infobox Firearm Cartridge
name= .240 Weatherby Magnum


caption=
origin= USA
type= Rifle
service=
used_by=
wars=
designer= Roy Weatherby
design_date=1968
manufacturer=Weatherby
production_date=
number=
variants=
is_SI_specs=
parent=
case type=Belted, bottleneck
bullet=.243
neck=.272
shoulder=.429
base=.453
rim_dia=.472
rim_thick=
case_length=2.496
length=3.100
rifling=1-10"
primer=Large rifle
is_SI_ballistics=
bw1=60
btype1=HP
vel1=3817
en1=1942
bw2=75
btype2=HP
vel2=3555
en2=2105
bw3=80
btype3=SP
vel3=3514
en3=2194
bw4=90
btype4=SP
vel4=3394
en4=2303
bw5=100
btype5=HP
vel5=3202
en5=2277
test_barrel_length=
balsrc= Hodgdon [http://data.hodgdon.com/cartridge_load.asp Hodgdon Online Reloading Data] ]

The .240 Weatherby Magnum was developed in 1968 by Roy Weatherby. In the development of his own .240in/6 mm cartridge, Weatherby was significantly influenced by both the success and the limitations of the .244 H&H Magnum cartridge devised in England by his friend and colleague David Lloyd. It was the last cartridge to be designed by Roy Weatherby. [http://www.chuckhawks.com/240weatherby.htm The .240 Weatherby Magnum by Chuck Hawks] ]

Design

The .240 Wby. Mag. is a proprietary cartridge used only in Weatherby rifles. This particular Weatherby case is unique, other than shape, it isn't physically based on other Weatherby cases, having the same rim diameter and similar length as the .30-06. It utilizes the traditional Weatherby rounded double shoulder and a belted case with a length of 2.496in, significantly shorter than the 2.8in case of the .244 H&H Mag. [http://www.chuckhawks.com/subscribers/rifle_cartridge_page/240weatherby.htm The .240 Weatherby Magnum by Chuck Hawks (subscription required)] ]

Performance

In terms of velocity, the .240 Weatherby is the fastest commercially produced 6 mm cartridge. There are of course several faster wildcat rounds available, but the .240 Wby outclasses the 6 mm Remington and the newer .243 WSSM by about convert|150|ft/s|m/s|abbr=on. [http://www.chuckhawks.com/subscribers/rifle_cartridge_page/compared_243WSSM_240.htm Compared: The .243 WSSM and .240 Weatherby Magnum by Chuck Hawks (subscription required)] ] While favoured by some varmint hunters, the .240 Wby. Mag. is not much liked by some reloaders because the case cannot be formed out of any other brass; one either has to buy Weatherby ammunition or reload used Weatherby cases which tend to be more expensive than those for more common cartridges. With the heavier bullets the .240 Wby. Mag. makes for a good deer hunting cartridge, but it does tend to require a long (>23in.) barrel in order to achieve peak performance.

ee also

* List of rifle cartridges

References

* [http://www.reloadbench.com/cartridges/240wm.html .240 Weatherby Magnum] at The Reload Bench
* [http://www.stevespages.com/jpg/cd240weatherbymagnum.jpgCartridge Dimensions] at Steves Pages
* [http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/243Cal(6.17 mm)/240%20Weatherby%20Magnum%20page%20209.pdf .240 Wby data] at Accurate Powder

External links

* [http://www.weatherby.com/products/ammo.asp?prd_id=2 Weatherby Web Site]


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