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What does WM stand for?

WM stands for Winchester Magnum

This definition appears very rarely

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Other Resources:
We have 36 other definitions for WM in our Acronym Attic

Samples in periodicals archive:

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.