Off the top of my head I want to say the M2 uses 12.7mm x 99mm, and the Russian 50 cal uses 12.7mm x 107mm. I could be off by a few mm.
Here we go:
http://en.wikipedia.org/wiki/12.7_x_107_mm
But these Russian rounds shouldn't even be able to chamber in the M2 as the case is too long for the bolt to close...
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Last edited by gunnut : 11-28-2006 at 04:44 AM.
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