FANDOM


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colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| .30-378 Weatherby Magnum Type Rifle Place of origin USA colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Production history Designer Weatherby Designed 1996 Manufacturer Weatherby Produced 1996 - Current colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Specifications Parent case .378 Weatherby Magnum Bullet diameter .308 in (Expression error: Unexpected < operator.
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 mm
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)
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Neck diameter .337 in (Expression error: Unexpected < operator.
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 mm
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)
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Shoulder diameter .561 in (Expression error: Unexpected < operator.
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 mm
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)
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Base diameter .582 in (Expression error: Unexpected < operator.
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 mm
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Rim diameter .579 in (Expression error: Unexpected < operator.
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 mm
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Case length 2.913 in (Expression error: Unexpected < operator.
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 mm
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Overall length 3.690 in (Expression error: Unexpected < operator.
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 mm
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Rifling twist 1-10" Primer type Large rifle magnum Maximum pressure 63,817 psi (Expression error: Unexpected < operator.
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 MPa
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| Ballistic performance Bullet weight/type Velocity Energy style="vertical-align:middle; border-bottom: 1px dotted #aaa;
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 m/s)
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Test barrel length: 26" (660 mm)
Source: Weatherby [1]

The .30-378 Weatherby Magnum is a cartridge introduced by Weatherby in 1996 that uses the same case as the previously existing .378 Weatherby Magnum and .460 Weatherby Magnum, necked down to a 30 caliber (.308 inches/Expression error: Unexpected < operator.

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 millimetres
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) bullet. It is offered with bullets between 165 and 200 grains (10.7 g and 13.0 g) in factory loading, generating velocities able to exceed 3,500 ft/s (Expression error: Unexpected < operator.
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 m/s)
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and muzzle energies over 4,750 foot-pounds force (Expression error: Unexpected < operator.
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.[1] The cartridge was originally designed for hunting game at very long distances, and for marksmanship competition in excess of 1,000 yards (Expression error: Unexpected < operator.
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 m
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.

PerformanceEdit

The .30-378 case holds as much as 120 grains (8

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of powder without requiring a compressed load. This allows the cartridge to develop more energy than the .300 Remington Ultra Magnum, .300 Winchester Magnum and .375 H&H Magnum, especially when handloads are used. The .30-378 has comparable muzzle energy to the larger .338 Lapua in military use. When bullets heavier than 200 grains (Expression error: Unexpected < operator.
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are loaded, the .30-378 can exceed the .458 Winchester Magnum in terms of both Muzzle Energy and Taylor Knockout Value.
Muzzle Energy Comparison
Cartridge Bullet Weight Muzzle velocity Muzzle energy Notes
gr g ft/s m/s ft·lbf J
.458 Win Mag 350 Expression error: Unexpected < operator.
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5,211 Template:Convert/N.m
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outperforms energy of .30-378 at all bullet weights
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4,775 Template:Convert/N.m
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Higher BC for better downrange performance
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4,757 Template:Convert/N.m
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4,661 Template:Convert/N.m
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4,354 Template:Convert/N.m
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similar to the .300 Win Mag, but outperforms it with heavy bullets.
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4,354 Template:Convert/N.m
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Note: Using the bullet weight and muzzle velocity in each cartridge that provided the maximum muzzle energy. Data for the .30-378 is from [1]. Loading data for all other cartridges can be found at [2]

Weatherby claims the .30-378 is currently the most powerful .30 caliber cartridge in the world, retaining more energy and velocity at one quarter mile than is possessed by a .30-06 upon leaving the barrel. However, the later claim appears not to be accurate when you compare bullets of the same weight, based on a check of available data (See chart below).

Performance at ¼ mile (440 yd or 402.3 m)
Cartridge Weight Ballistic
Coefficient
Muzzle Velocity Muzzle Energy Velocity at 440 yd Energy at 440 yd
gr g ft/s m/s ft·lbf J ft/s m/s ft·lbf J
.30-06 165 11
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3,165 Template:Convert/N.m
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1,633 Template:Convert/N.m
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.30-378 165 11
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4,448 Template:Convert/N.m
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2,428 Template:Convert/N.m
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.30-06 180 12
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3,130 Template:Convert/N.m
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.30-378 180 12
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.30-06 200 13
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.30-378 200 13
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Note: data for the .30-378 from Weatherby[1] (which tracks closely to what handloaders can achieve based on loading data at [2]. Data from the .30-06 is also from Hodgdon.[2] The initial data used is included here for anyone who cares to run the calculations themselves.

CostsEdit

Rifles built by Weatherby are available in .30-378, and ammunition is significantly more expensive than other cartridges, with ammunition costing upwards of $100 USD for a box of 20 rounds as of 2007.[3] Weatherby offers this caliber in several versions of its Mark V rifle. Due to the strong recoil a round of this energy can create, all Weatherby rifles offered in this caliber include a muzzle-brake. Sako offers the TRG-S also in .30-378 Weatherby.

CategoriesEdit

Cartridge:rifles
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