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In 1963, Winchester introduced the .284, giving hunters optimum power in a short action rifle. The .284 never truly gained mainstream popularity due to the lever action rifle it was chambered in. The vast majority of hunters worldwide prefer bolt action rifles. In 2001 Winchester introduced the .300 WSM, a high powered cartridge designed for use in short, bolt action rifles. Following this Winchester released the .270WSM and 7mm WSM cartridges in 2002.  The 7mm Winchester Short Magnum 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. 
Rifling twist: 1 turn in 9.5"
Case length: 2.100 in (53.3 mm)
Parent case: .404 Jeffery
Bullet diameter: 0.284 in (7.2 mm)
Base diameter: 0.555 in (14.1 mm)
Neck diameter: 0.321 in (8.2 mm)
Shoulder diameter: 0.538 in (13.7 mm)

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