|- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .378 Weatherby Magnum |- | colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;" | Image:Munit01.jpg |- ! style="padding-right: 1em;" | Type | colspan="2" | Centerfire/Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | South Gate, California |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history |- | Specifications |- mm ) mm ) mm ) mm ) mm ) mm ) mm ) mm ) |- |- |- |- |- |- g) m/s)
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| - |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .378 Weatherby Magnum |- | colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;" | Image:Munit01.jpg |- ! style="padding-right: 1em;" | Type | colspan="2" | Centerfire/Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | South Gate, California |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history |- | Specifications |- mm ) mm ) mm ) mm ) mm ) mm ) mm ) mm ) |- |- |- |- |- |- g) m/s)
- The .378 Weatherby Magnum was designed by Roy Weatherby in 1953. It was an original belted magnum design with no parent case, inspired by the .416 Rigby and headspacing of the belted .375 H&H Magnum. The 215 magnum rifle primer was developed by Federal specifically for this round. The cartridge can hold upwards of 7.13 g (120 gr) of powder. The 378 Weatherby Magnum cartridge also has the double radius shoulder design found on the first and smaller proprietary line of Weatherby magnum cartridges.
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| sameAs
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| Length
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| btype
| - Full Metal Jacket
- Round nose
- Truncated solid
- Partitiion Type
- Partition Type
- Pointed soft point
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| dcterms:subject
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| dbkwik:publicsafet...iPageUsesTemplate
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| dbkwik:vietnam-war...iPageUsesTemplate
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| dbkwik:vietnamwar/...iPageUsesTemplate
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| BW
| - 260(xsd:integer)
- 270(xsd:integer)
- 300(xsd:integer)
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| balsrc
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| Origin
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| primer
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| En
| - 5615(xsd:integer)
- 5699(xsd:integer)
- 5743(xsd:integer)
- 6062(xsd:integer)
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| Name
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| Type
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| Caption
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| vel
| - 2925(xsd:integer)
- 3060(xsd:integer)
- 3140(xsd:integer)
- 3180(xsd:integer)
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| case length
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| test barrel length
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| Base
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| Manufacturer
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| neck
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| case type
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| rim dia
| - 0(xsd:double)
- 0(xsd:double)
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| rim thick
| - 0(xsd:double)
- 0(xsd:double)
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| rifling
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| Bullet
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| production date
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| shoulder
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| design date
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| Designer
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| abstract
| - |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .378 Weatherby Magnum |- | colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;" | Image:Munit01.jpg |- ! style="padding-right: 1em;" | Type | colspan="2" | Centerfire/Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | South Gate, California |- |- |- |- |- ! 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" | ca1950 |- ! style="padding-right: 1em;" | Manufacturer | colspan="2" | Weatherby |- ! style="padding-right: 1em;" | Produced | colspan="2" | 1953-Present |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Specifications |- |- ! style="padding-right: 1em;" | Case type | colspan="2" | Belted |- ! 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;" | Rim thickness | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Case length | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Overall length | colspan="2" | in (mm ) |- |- ! style="padding-right: 1em;" | Rifling twist | colspan="2" | 1 in 12 |- ! 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) Full Metal Jacket||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) Round nose||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) Truncated solid||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) Pointed soft point||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) Partitiion Type||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- | colspan="3" style="text-align: center; padding-top: 5px; font-size: 90%;" | Test barrel length: 26 in (66 cm)Source: Weatherby / Nosler |} The .378 Weatherby Magnum was designed by Roy Weatherby in the early 1950s. The .378 Weatherby Magnum is an original design with no parent case. The belted magnum cartridge was inspired by the capacity of the .416 Rigby case and headspacing of the .375 H&H Magnum belted case. The Magnum rifle primer, named the 215 primer was developed by Federal Cartridge Company for the .378 Weatherby Magnum cartridge. The .378 Weatherby Magnum cartridge can hold upwards of 7.13 g (110 gr) of powder. The 378 Weatherby Magnum cartridge also has the double radius shoulder design found on the first and smaller proprietary line of Weatherby magnum cartridges. The .378 Weatherby Magnum cartridge was put into production 1953 to replace the .375 Weatherby Magnum. The motivation behind the development of the .378 Weatherby Magnum came from the disappointing performance gains of the improved, .375 Weatherby Magnum over its parent case, the .375 H&H Magnum. Roy Weatherby in 1953 shot an African Elephant with one bullet while on safari. However in using this event as a marketing tool, it was revealed that some African countries have a minimum 12.43 mm (.40 caliber) bullet size for hunting dangerous game. The Weatherby company responded by necking up the .378 Weatherby Magnum to 11.63 mm (.458 caliber) and called the new cartridge, the .460 Weatherby Magnum; introduced in 1958. The .378 Weatherby Magnum is considered a Safari grade cartridge designed to hunt large African game animals. The .378 Weatherby Magnum is appropriate for taking all African game animals from large African antelopes, Nile crocodile (Crocodylus niloticus), Hippopotamus (Hippopotamus amphibius), to the Big Five game. Some hunters on the North American continent employ the .378 Weatherby Magnum for use when hunting American Elk (cervas canadensis), Brown Bears (Ursus arctos) and Polar Bears (Ursus maritimus). The .378 Weatherby Magnum will generate considerable free recoil; an average of 104 J (77 ft·lbf) from a 4.1 kg (9 lb) rifle. This is in comparison to an average free recoil of 27 J (20 ft · lbf) from a rifle chambered for .30-06 Springfield. It is written that the .378 Weatherby Magnum will create a greater felt recoil than other cartridges, but this concept is at odds with the laws of physics. This misconception has likely done a lot to reduce the popularity of this caliber. This includes two of its off-spring; the .416 Weatherby Magnum and .460 Weatherby Magnum. The .378 Weatherby Magnum has been responsible for numerous wildcat cartridges, being necked-down to the .22 Eargesplitten Loudenboomer (5.56 mm) and being necked-up .500 A-Square (12.7 mm). Some of the .378 Weatherby Magnum wildcat cartridges are shortened versions, like the .30-378 Arch (7.62 mm) and the .460 Short A-Square (11.63 mm). Some of the .378 Weatherby Magnum wildcat cartridges have gone on to be part of the Weatherby line: .30-378 Weatherby Magnum; .338-378 Weatherby Magnum; .416 Weatherby Magnum and .460 Weatherby Magnum.
- The .378 Weatherby Magnum was designed by Roy Weatherby in 1953. It was an original belted magnum design with no parent case, inspired by the .416 Rigby and headspacing of the belted .375 H&H Magnum. The 215 magnum rifle primer was developed by Federal specifically for this round. The cartridge can hold upwards of 7.13 g (120 gr) of powder. The 378 Weatherby Magnum cartridge also has the double radius shoulder design found on the first and smaller proprietary line of Weatherby magnum cartridges. The motivation behind the development of the .378 came from the disappointing performance gains of the improved,.375 Weatherby over its parent case, the .375 H&H Magnum. Roy Weatherby in 1953 killed an African elephant with one shot while on safari. However in using this event as a marketing tool, it was revealed some African countries have a minimum 10.16 mm (.40 caliber) bullet size for hunting dangerous game. Weatherby responded by necking up the .378 to 11.63 mm (.458 caliber) and called the new cartridge the .460 Weatherby Magnum, which was introduced in 1958. It is considered a Safari grade cartridge. The .378 Weatherby Magnum is appropriate for taking all African game animals from large African antelopes, Nile crocodile, hippopotamus, to the Big Five game. Some hunters on the North American continent employ the .378 for American elk, Brown bears, and polar bears. The .378 Weatherby will generate considerable free recoil, an average of 104 J (77 ft·lbf) from a 4.1 kg (9 lb) rifle. This compares to 27 J (20 ft·lbf) from a rifle chambered for .30-06 Springfield. But is only 10% more than the recoil of the .375 H&H Magnum while having 22% more energy. It has less recoil than almost all cartridges of its energy. While the recoil is stiff, exaggerations have likely done a lot to reduce the popularity of this caliber. The .378 has been responsible for numerous wildcat cartridges, being necked-down as the .22 Eargesplitten Loudenboomer and necked-up as the .500 A-Square. Some of the .378 Weatherby Magnum wildcat cartridges are shortened versions, like the .30-378 Arch (7.62 mm) and the .460 Short A-Square (11.63 mm). Some .378-based wildcats have gone on to be part of the Weatherby line: .30-378, .338-378, .416 and .460.
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