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A military small & medium caliber ammunition collection

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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, red tip, 1 knurled crimping cannelure
Casebrass, taper crimp
Primerpercussion, flat, brass, ring crimp, red annulus
HeadstampW C C 8 8
NotesExperimental Phase 2 duplex round for Advanced Combat Rifle (ACR) trials at Fort Benning, GA. 23.9 grains of powder with two 35.0 grain hollow-base projectiles. From box labeled: 5.56MM FULL CALIBER DUPLEX AMMUNITION PHASE II TEST AND DEMO. ROUNDS LOADED 3-23-88