7mm Winchester Short Magnum

7 mm Winchester Short Magnum

WSM and WSSM family of cartridges. From left to right: .223 WSSM, .243 WSSM, .25 WSSM, .270 WSM, 7 mm WSM, .300 WSM, .325 WSM.

Type

Rifle

Place of origin

United States

Production history

Designer

Winchester

Designed

2001

Specifications

Parent case

.404 Jeffery

Case type

rebated rim, bottleneck

Bullet diameter

0.284 in (7.2 mm)

Neck diameter

0.321 in (8.2 mm)

Shoulder diameter

0.538 in (13.7 mm)

Base diameter

0.555 in (14.1 mm)

Rim diameter

0.535 in (13.6 mm)

Case length

2.100 in (53.3 mm)

Rifling twist

1 turn in 9.5"

Primer type

large rifle magnum

Ballistic performance

Bullet mass/type	Velocity	Energy
160 gr (10 g)	3,050 ft/s (930 m/s)	3,304 ft·lbf (4,480 J)

Source(s): Winchester ^[1]

The 7mm Winchester Short Magnum (also known as the 7mm WSM) is a centrefire cartridge developed in partnership with Browning Arms Company and Winchester ammunition, making its debut and introduced to the shooting public in 2001.

Specifications

The 7mm WSM is similar to the .300 WSM and .270 WSM cases necked down to handle .284" bullets. However, the distance from the casehead to the datum line on the shoulder is longer for the 7WSM, preventing accidental chambering or firing of the .284" 7mm bullet in .270 WSM's .277" bore.

Performance

The 7mm WSM cartridge achieves its useful purpose as an excellent cartridge for larger mule deer, sheep, black bear and elk.

Winchester claims a muzzle velocity (MV) of 3,225 ft/s with a 140 grain bullet for their 7mm WSM cartridge; the claimed muzzle energy (ME) is 3,233 ft. lbs. With a 160 grain bullet the Winchester figures are 2990 ft/s and 3176 ft. lbs. at the muzzle. The lighter, shorter 7mm bullets are preferred in these short case magnums.^[2]

Popularity

The 7mm WSM has failed to gain the same popularity as the other cartridges in the WSM family. The shortened necks of the cases don't make the 7mm WSM particularly well suited to heavier bullets, limiting the cartridges usefulness on larger game. As well the 7mm WSM shoots about 100 ft/s slower than the 7mm Remington Magnum with heavier bullets.^[3]

Cost is another factor limiting popularity. Ammunition prices are higher than that of the 7mm Remington Magnum and of the .280 Remington.^[4] Both of which have similar performance to the 7mm WSM, with the 280 Rem having slightly less muzzle energy and the 7mm Rem Mag having slightly more.^[5]

References

↑ Winchester load data
↑ Barnes, Frank C. (2006) [1965]. Skinner, Stan, ed. Cartridges of the World (11th ed.). Iola, WI, USA: Gun Digest Books. ISBN 0-89689-297-2.
↑ http://www.chuckhawks.com/short_magnums.htm
↑ http://www.chuckhawks.com/factory_ammo_prices.htm
↑ http://www.ballisticstudies.com/Knowledgebase/7mm+Winchester+Short+Magnum.html

7mm Cartridge Guide, 7mm WSM section

Winchester firearms and cartridges

Rifles

Lever-action	Henry rifle Model 1866 Model 1873 Model 1876 Model 1886 Model 1892 Model 1894 Model 1895 Model 53 Model 55 Model 64 Model 65 Model 71 Model 88 Model 150 Model 250 Model 255 Model 9422
Bolt-action	Model 1878 Hotchkiss Model 1895 Lee Navy Model 1900 Model 1902 Model 1904 Model 43 Model 47 Model 51 Imperial Model 52 Model 54 Model 56 Model 57 Model 58 Model 59 Model 60 Model 60A Model 67 Model 68 Model 69 Model 70 Model 72 Model 75 Model 121 Model 131 Model 141 Model 320 Model 325 Model 670 Model 770
Pump-action	Model 1890 Model 1906 Model 61 Model 62 Model 62A Model 270
Semi-automatic	Model 1903 Model 1905 Model 1907 Model 1910 Model 30 Model 63 Model 74 Model 77 Model 100 Model 190 Model 490
Full-automatic	Olin/Winchester FAL Model 1917
Falling-block action	Model 1885

Shotguns

Pump-action	Model 1893 Model 1897 Model 1912 Model 25 Model 42 Model 1200 Model 1300
Lever-action	Model 1887 Model 1901 Model 9410
Single-shot	Model 20 Model 36 Model 37 Model 37A Model 41
Double-barrel	Model 21 Model 24 Model 96 Model 101
Semi-automatic	Model 1911 SL Model 40 Model 50 Model 59 Model 1400 Model 1500 SX-1

Cartridges

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7mm Winchester Short Magnum

Specifications

Performance

Popularity

See also

References