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.338-378 wby mag FOR SALE AT BEST PRICE

.338-378 WBY MAG AMMO

In Stock .338-378 WBY MAG Ammo Available For Sale From Top Retailers

Find all the .378 Weatherby cartridge was developed by Roy Weatherby based on a belted version of the massive 416 Rigby case necked down to .375".

This was introduced as a Weatherby proprietary cartridge in 1953. During the 1960s, U.S gun writer Elmer Keith and Bob Thompson created the wildcat .338-378 by shortening the .378 case slightly and necking it down to .338".

The .338-378 Weatherby Magnum is appropriate for hunting all game animals on the North American, European and Asian continents. In Africa, the 338-378 Weatherby Magnum is suitable for taking medium and large game.

The .338-378 Weatherby currently maintains a modest following for hunting big game at long ranges.

About: .338-378 Wby Mag

  • Type: Centerfire/Rifle
  • Place of origin: United States
  • Designer: Elmer Keith and Bob Thomson
  • Designed: ca1963
  • Manufacturer : Weatherby
  • Produced: 1998


  • Parent case: .378 Weatherby Magnum
  • Case type: Belted
  • Bullet diameter: .338 in (8.6 mm)
  • Neck diameter: .361 in (9.2 mm)
  • Shoulder diameter: .560 in (14.2 mm)
  • Base diameter: .582 in (14.8 mm)
  • Rim diameter : .603 in (15.3 mm)
  • Rim thickness: .059 in (1.5 mm)
  • Case length: 2.905 in (73.8 mm)
  • Overall length: 3.65 in (93 mm)
  • Case capacity: 125 gr H2O (8.1 cm3)
  • Rifling twist: 1 in 10
  • Primer type: Magnum Rifle
  • Maximum pressure: 63,817 psi (440.00 MPa)

Ballistic performance

Bullet mass/type Velocity Energy
250 gr (16 g) Partition type 3,060 ft/s (930 m/s) 5,197 ft⋅lbf (7,046 J)
225 gr (15 g) Truncated solid 3,180 ft/s (970 m/s) 5,052 ft⋅lbf (6,850 J)
200 gr (13 g) Boat-tail soft point 3,350 ft/s (1,020 m/s) 4,983 ft⋅lbf (6,756 J)

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