Thread: 5.56x45mm and .223 Remington????
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Old April 8, 2007, 11:50 PM   #3
Lavid2002
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Join Date: April 6, 2007
Posts: 2,568
headspace
The difference is in headspace...only by a little bit though...Its like the dif. between the .223REM and .223NATO rounds
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