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U.S. Small arms calibers in the Sand Pits

v35v35 Member Posts: 12,710 ✭✭✭
edited October 2008 in Ask the Experts
Any info on calibers other than 9mm,223, 7.62x39, .308 & 50BMG in use by US forces or contractors and their effectiveness.
Are contractors limited to FMJ?
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