7mm Weatherby Magnum

The 7 mm Weatherby Magnum is a powerful 7 mm rifle cartridge offered by the Weatherby firearms company in their Mark V rifles. The cartridge was one of the first cartridges offered by the Weatherby company.[1]

7 mm Weatherby Magnum
7 mm Weatherby cartridge
TypeGame Cartridge
Place of originUnited States
Production history
DesignerRoy Weatherby
DesignedCirca 1940 (1940)
Specifications
Case typeBelted, Bottleneck
Bullet diameter.284 in (7.2 mm)
Neck diameter.312 in (7.9 mm)
Shoulder diameter.490 in (12.4 mm)
Base diameter.511 in (13.0 mm)
Rim diameter.530 in (13.5 mm)
Rim thickness.048 in (1.2 mm)
Case length2.55 in (65 mm)
Overall length3.25 in (83 mm)
Rifling twist1:10
Primer typeLarge Rifle
Maximum pressure65,000 psi
Ballistic performance
Bullet mass/type Velocity Energy
160 gr (10 g) AccuBond 3,050 ft/s (930 m/s) 3,306 ft⋅lbf (4,482 J)
139 gr (9 g) Spire Point 3,240 ft/s (990 m/s) 3,343 ft⋅lbf (4,532 J)
154 gr (10 g) Spire Point 3,123 ft/s (952 m/s) 3,401 ft⋅lbf (4,611 J)
120 gr (8 g) TTSX 3,430 ft/s (1,050 m/s) 3,136 ft⋅lbf (4,252 J)
175 gr (11 g) A-Frame 3,070 ft/s (940 m/s) 3,662 ft⋅lbf (4,965 J)
Test barrel length: 26
Source(s): Midwayusa.com

It was developed in the 1940s by Roy Weatherby. The 7 mm Weatherby Magnum did not get a lot of exposure until the early part of the 1950s when the Weatherby rifles became more available. The more popular 7mm Remington Magnum was introduced in 1962 with very similar ballistics when compared to the 7mm Weatherby.[2] It is a great cartridge for a one-rifle hunter that shoots long distances. It has taken game of all sizes around the world.

Weatherby Mark V in 7 mm Weatherby

Hunting

The 7mm Weatherby Magnum is useful for all American plains game including the great Bears and the American Bison. It is also particularly useful when African and Australian plains game are hunted. It is an ultra high velocity cartridge giving about 300-400 fps higher velocity with lighter bullets than the more popular 30-06 Springfield which is regarded as considerably fast. It is quite easy to flinch in anticipation of the significant recoil. Care must be taken to confirm what twist rate was used, as the earlier West German 7mm Weatherby's used a 1 in 12 twist vs the faster 1 in 10 twist for those of later manufacture. The 1x12 twist rifles will not stabilize bullets over 150 grains, while the 1x10 twist rifles will stabilize bullets weighing up to 175 grains.

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See also

References
  1. Speer Reloading Manual Rife & Pistol Number 13
  2. Bullets, Speer (2009). Speer Bullets Reloading Manual #14. Speer. p. 409. ISBN 978-0-9791860-0-4.


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