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300
WSM
.300 Winchester Short
Magnum (also known as .300 WSM) is a .30 caliber rebated rim bottlenecked
centerfire short magnum cartridge that was introduced in 2001 by Winchester.
The cartridge overall length is 72.64 mm, cartridge case is 53.34 mm in length
and the bullet diameter is .308 in (7.62 mm), which is common to all U.S. .30
caliber cartridges. The principle at work in the short magnum cartridge is the
advantage of fitting larger volumes of powder in closer proximity to the
primer's flash hole, resulting in more uniform, consistent ignition. In field
use, this round mirrors the performance of its older counterpart, the .300
Winchester Magnum, which is based on a modified .375 Holland & Holland
belted magnum casing.
The advantage to this
round is ballistics that are nearly identical to the .300 Winchester Magnum,
but in a lighter rifle with a shorter action. A disadvantage of cartridge case
designs with relatively large case head diameters lies in relatively high bolt
thrust levels exerted on the locking mechanism of the employed firearm. Also in
small ring actions the larger chamber diameter removes more steel from the
barrel tenon making it weaker in a radial direction.
Suggested
Use
- Deer (long range)
- Black Bear (long range)
- Sheep / Goat (long range)
- Moose
- Elk
- Buffalo / Bison
Performance
Muzzle velocity
10.69 g (165 gr) Full
Metal Jacket(FMJ): 982 m/s (3,223 ft/s)
11.66 g (180 gr) Full
Metal Jacket(FMJ): 943 m/s (3,095 ft/s)
The .300 WSM is adequate
for hunting moose, black bear, brown bear, elk, mule deer, and white-tailed
deer in forests and plains where long range, flat shots are necessary. The .300
WSM is also used in benchrest shooting.
The .300 WSM has a
standard bullet diameter of .308 or 7.62mm and takes advantage of the numerous
bullet options available in that caliber.
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