.257 Weatherby Magnum

Infobox Firearm Cartridge
name= .257 Weatherby Magnum


caption=
origin= USA
type= Rifle
designer= Roy Weatherby
design_date=1944
manufacturer= Weatherby
production_date=1944-Present
number=
variants=
is_SI_specs=
parent=.300 H&H Magnum
case type=Belted Magnum
bullet=.257
neck=.288
shoulder=.496
base=.514
rim_dia=.534
rim_thick=
case_length=2.560
length=
rifling=
primer=large rifle magnum
is_SI_ballistics=
bw1=87
btype1=SP
vel1=3825
en1=2826
bw2=100
btype2=SP
vel2=3602
en2=2881
bw3=117
btype3=BST
vel3=3400
en3=2952
bw4=120
btype4=Partition
vel4=3305
en4=2910
bw5=
btype5=
vel5=
en5=
test_barrel_length=
balsrc= Weatherby [http://www.weatherby.com/products/ammo.asp?prd_id=3 Weatherby Inc] ] The .257 Weatherby Magnum was introduced as a wildcat during the mid 1940s when Roy Weatherby was building custom rifles around war surplus '03 Springfield and the '98 Mauser actions. It was always his favorite cartridge.

The .257 Weatherby Magnum cartridge case itself a shortened version of the .300 H&H Magnum case necked down to .257 caliber and blown out the full length of the case which then sports a double radius shoulder and shortened to 2.545" with a long neck.

The 257 Weatherby Magnum is an extremely flat-shooting dual-purpose cartridge and is the fastest of all commercially available 25 caliber cartridges, sending a convert|75|gr|g|sing=on bullet out the muzzle at 3,900 feet per second (1,190 m/s) for varmints and able to send a convert|115|gr|g|sing=on bullet out the muzzle at 3,400 feet per second (1,040 m/s) for deer sized game. It is well suited for plains hunting and other areas where very long range shooting is expected.

ee also

* Weatherby
* .25-06 Remington
* .25 WSSM
* .257 Roberts
* List of rifle cartridges

References

* [http://www.chuckhawks.com/25mag.htm The .257 Weatherby Magnum] by Chuck Hawks
* [http://www.reloadbench.com/cartridges/257wm.html .257 Weatherby Magnum] at The Reload Bench

External links

* [http://www.shootingtimes.com/ammunition/ST257weatherbymagnum_031706/ In Praise of the .257 Weatherby Magnum] article in Shooting Times
* [http://www.chuckhawks.com/ultra-long-range.htm Ultra-Long Range Rifles and Cartridges] by Chuck Hawks