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What does WM stand for?

WM stands for Winchester Magnum

This definition appears very frequently

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Other Resources:
We have 36 other meanings of WM in our Acronym Attic

Samples in periodicals archive:

22 WINCHESTER MAGNUM RIMFIRE FACTORY AMMO PERFORMANCE CCIMAXI-MAG 1,461 1-3/8 CCI MAXI-MAG TNT 1,680 1-7/8 CCI MAXI-MAG +V HP 1,737 1-3/4 CCI GOLD DOT HP 1,422 1-1/2 WINCHESTER 28-GRAINJHP 1,827 1-1/8 WINCHESTERJHP 1,790 1-1/8 Notes: Groups the product of eight shots at 20 yards.
Developed in cooperation with Browning and Winchester Firearms, the 300 WSM design increases the efficiency of the powder burn to deliver velocities equal to a regular-length 300 Winchester Magnum.
The first new sporting rifle cartridge from Winchester in 20 years, the 300 WSM features a 30 caliber cartridge that delivers 300 Winchester Magnum performance from a short-action rifle.