|- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .257 Weatherby Magnum |- | colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;" | Image:Munit04.jpg |- ! style="padding-right: 1em;" | Type | colspan="2" | Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | USA |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history |- | Specifications |- ! style="padding-right: 1em;" | Bullet diameter | colspan="2" | in (mm
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| - |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .257 Weatherby Magnum |- | colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;" | Image:Munit04.jpg |- ! style="padding-right: 1em;" | Type | colspan="2" | Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | USA |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history |- | Specifications |- ! style="padding-right: 1em;" | Bullet diameter | colspan="2" | in (mm
- The .257 Weatherby Magnum is a .25 Caliber (6.35 mm) belted bottlenecked cartridge. It is one of the original standard length magnums developed by shortening the .375 H&H Magnum case to approx. . Of the cartridges developed by Roy Weatherby, the .257 Weatherby Magnum was known to have been his favorite, and the cartridge currently ranks third in Weatherby cartridge sales, after the .30-378 Weatherby Magnum and the .300 Weatherby Magnum.
- The .257 Weatherby Magnum is a .25 Caliber (6.35 mm) belted bottlenecked cartridge. It is one of the original standard length magnums developed by shortening the .375 H&H Magnum case to approx. in ( mm). Of the cartridges developed by Roy Weatherby, the .257 Weatherby Magnum was known to have been his favorite, and the cartridge currently ranks third in Weatherby cartridge sales, after the .30-378 Weatherby Magnum and the .300 Weatherby Magnum.
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| BW
| - 87(xsd:integer)
- 100(xsd:integer)
- 117(xsd:integer)
- 120(xsd:integer)
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| balsrc
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| Origin
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| primer
| - large rifle magnum
- Large Rifle
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| En
| - 2826(xsd:integer)
- 2881(xsd:integer)
- 2910(xsd:integer)
- 2952(xsd:integer)
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| Name
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| Type
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| vel
| - 3305(xsd:integer)
- 3400(xsd:integer)
- 3602(xsd:integer)
- 3825(xsd:integer)
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| case length
| - 2(xsd:double)
- 2(xsd:double)
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| test barrel length
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| Base
| - 0(xsd:double)
- 0(xsd:double)
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| Manufacturer
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| neck
| - 0(xsd:double)
- 0(xsd:double)
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| case type
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| Parent
| - 0(xsd:double)
- 0(xsd:double)
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| rim dia
| - 0(xsd:double)
- 0(xsd:double)
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| rim thick
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| case capacity
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| rifling
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| Bullet
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| production date
| - 1944(xsd:integer)
- 1948(xsd:integer)
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| max pressure
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| shoulder
| - 0(xsd:double)
- 0(xsd:double)
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| design date
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| abstract
| - |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .257 Weatherby Magnum |- | colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;" | Image:Munit04.jpg |- ! style="padding-right: 1em;" | Type | colspan="2" | Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | USA |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history |- ! style="padding-right: 1em;" | Designer | colspan="2" | Roy Weatherby |- ! style="padding-right: 1em;" | Designed | colspan="2" | 1944 |- ! style="padding-right: 1em;" | Manufacturer | colspan="2" | Weatherby |- ! style="padding-right: 1em;" | Produced | colspan="2" | 1944-Present |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Specifications |- ! style="padding-right: 1em;" | Parent case | colspan="2" | .300 H&H Magnum |- |- ! style="padding-right: 1em;" | Bullet diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Neck diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Shoulder diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Base diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Rim diameter | colspan="2" | in (mm ) |- |- ! style="padding-right: 1em;" | Case length | colspan="2" | in (mm ) |- |- |- |- ! style="padding-right: 1em;" | Primer type | colspan="2" | large rifle magnum |- |- |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Ballistic performance |- style="text-align: center; font-size: 90%; background: #DEDEDE;" cellspacing="0" cellpadding="0" ! Bullet weight/type ! Velocity ! Energy |- style="text-align: center; font-size: 90%;" | style="vertical-align:middle; border-bottom: 1px dotted #aaa; " | gr (g) SP||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- style="text-align: center; font-size: 90%;" | style="vertical-align:middle; border-bottom: 1px dotted #aaa; " | gr (g) SP||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- style="text-align: center; font-size: 90%;" | style="vertical-align:middle; border-bottom: 1px dotted #aaa; " | gr (g) BST||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- style="text-align: center; font-size: 90%;" | style="vertical-align:middle; border-bottom: 1px dotted #aaa; " | gr (g) Partition||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- style="text-align: center; font-size: 90%;" |- | colspan="3" style="text-align: center; padding-top: 5px; font-size: 90%;" | Source: Weatherby |} 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 75 grain bullet out the muzzle at 3,900 feet per second (1,190 m/s) for varmints and able to send a 115 grain 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.
- The .257 Weatherby Magnum is a .25 Caliber (6.35 mm) belted bottlenecked cartridge. It is one of the original standard length magnums developed by shortening the .375 H&H Magnum case to approx. . Of the cartridges developed by Roy Weatherby, the .257 Weatherby Magnum was known to have been his favorite, and the cartridge currently ranks third in Weatherby cartridge sales, after the .30-378 Weatherby Magnum and the .300 Weatherby Magnum. The .257 Weatherby Magnum is among one of the flattest shooting commercial cartridges. It is capable of firing a Nosler Ballistic Tip bullet at generating of energy which is comparable to factory loadings of the .30-06 Springfield and the .35 Whelen in terms of energy. Discrepancies between the metric and U.S. diameters of the bullet may cause some confusion. A .257 bullet has a metric bullet diameter of 6.53 mm. However, in Europe cartridge designation nomenclature for a large part relies on the bore diameter. As the bore diameter of the rifle is .250 inches this would make the .257 Weatherby Magnum a 6.35 mm caliber cartridge rather than a 6.5mm caliber cartridge.
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