7 mm WSM

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. The 7mm WSM is based on the .300 WSM case necked down to handle .284" bullets. Winchester claims a muzzle velocity (MV) of 3,225 fps 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 fps and 3176 ft. lbs. at the muzzle. The lighter, shorter 7mm bullets are preferred in these short case magnums. [Cartridges of the World, 11th Edition by Frank Barnes, 2006 ] The 7mm WSM cartridge achieves its useful purpose as an excellent cartridge for larger, mule deer, sheep, black bear and elk, 28 caliber is a time proven caliber for elk, deer size game animals.

7mm WSM Barrel Specifications
Common Barrel Twist Rate - 1 in 9 1/2".
Bore Groove Diameter - .284"

7mm WSM Reloading Specifications
Bullet Diameter - .284"
Maximum Case Length - 2.100"
Trimmed Case Length - 2.090"
Primer Size - Large Rifle

References

1. [http://www.amazon.com/Cartridges-World-11th-Frank-Barnes/dp/0896892972 Cartridges of the World (11th Edition), Frank Barnes 2006]