. 223 SBR vs carbine ballistics

5.56/.223 ballistic test carbine vs SBR I have been working on a a few projects for Barnes Precision Machine, one of which was a ballistic test for a common barrel length for SBR and compare that to the AR-15 carbine 16″ barrel. Some history of the 5.56 to begin with. The 5.56x45mm NATO began life…