.340 Weatherby Magnum
A .340 Weatherby Magnum cartridge in between a .308 Winchester cartridge and a 9x19mm cartridge.
Type Rifle
Place of origin United States
Production history
Designer Roy Weatherby
Designed 1962
Manufacturer Weatherby
Produced 1963 to present
Parent case .300 H&H Magnum, full length
Case type Rimless, Bottlenecked with venturi shoulder
Bullet diameter .338 in (Bad rounding hereScript error mm)
Neck diameter .366 in (Bad rounding hereScript error mm)
Shoulder diameter .495 in (Bad rounding hereScript error mm)
Base diameter .513 in (Bad rounding hereScript error mm)
Rim diameter .530 in (Bad rounding hereScript error mm)
Rim thickness .048 in (Bad rounding hereScript error mm)
Case length 2.82 in (Bad rounding hereScript error mm)
Overall length 3.6 in (Bad rounding hereScript error mm)
Case capacity 98 gr H2O (6.37 cm³)
Primer type large rifle magnum
Ballistic performance
Bullet weight/type Velocity Energy
200 gr (Bad rounding hereScript error g) SP3,221 ft/s (Bad rounding hereScript error m/s)4,607 ft·lbf (Bad rounding hereScript error J)
225 gr (Bad rounding hereScript error g) SP3,066 ft/s (Bad rounding hereScript error m/s)4,696 ft·lbf (Bad rounding hereScript error J)
250 gr (Bad rounding hereScript error g) SP2,963 ft/s (Bad rounding hereScript error m/s)4,873 ft·lbf (Bad rounding hereScript error J)
Source(s): Weatherby [1]

The .340 Weatherby Magnum rifle cartridge was introduced in 1963 by creator Roy Weatherby in response to the .338 Winchester Magnum.[1] The .340 Weatherby Magnum uses the same .338 in. diameter bullets as the .338 Winchester Magnum but it does so at greater velocity than its Winchester competition. Reloaders may have trouble matching the published Weatherby velocities as Weatherby factory ammunition is loaded to maximum specifications.[2] Weatherby no longer loads the 250gr. round-nose cartridge pictured but continues to load the 250 gr. Spire Point and 250 gr. Nosler Partition. Weatherby has also expanded their factory loads including Nosler Ballistic-tip and Barnes TSX bullets complementing the powerful cartridge.[3] Currently A-square is the only other factory ammunition producer of the .340 Weatherby Magnum which has led to limited popularity of the caliber. In field tests the .340 clearly out performs the 300 Ultra mag, .338 win mag. and even rivals the larger .375 H&H, providing a much flatter shooting and harder hitting performance.

This cartridge is powerful enough for even the largest North American game and is suitable for most African game as well.[4]

See alsoEdit


  1. 1.0 1.1 Weatherby Inc. .340 Weatherby Magnum information page
  2. "The .340 Weatherby Mag" by Chuck Hawks
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