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5.56 x 45mm United States

5.56 x 45mm Duplex United States W C C 8 8 profile view.5.56 x 45mm Duplex United States W C C 8 8 head view.

Details

TypeDuplex
ProjectileFMJ, GM, steel core, 1 knurled crimping cannelure
Casebrass, segmented taper crimp
Primerpercussion, flat, brass, ring crimp
HeadstampW C C 8 8
NotesColt experimental Phase 3 duplex round for Advanced Combat Rifle (ACR) trials. 22.2 grains of powder, front projectile is 34.7 grains with a hollow base, rear projectile is 33.0 grains with a flat base. From box labeled: 5.56MM DUPLEX PHASE III COLT TEST RDS LOADED 12-23-88 FLUOROSCOPED (fluoroscoped stamped in red).