Aerodynamic and Flight Dynamic Characteristics of the New Family of 5. 56mm NATO Ammunition
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Free flight spark photography range tests, Mann barel accuracy tests, and long-range limit-cycle yaw tests were conducted with the U.S. M855M856 ammunitions, and the Belgian FNB SS-109L110 ammunition. Tolerances in bullet jacket wall thickness and bullet seating alignment were identified as contributing to the dispersion problem in U.S. ammunition. The aerodynamic characteristics of the four projectiles were determined, and the gyroscopic stability was found to be sufficient. All four projectiles are dynamically stabel at supersonic speeds. The M855-SS-109 projectiles show limit-cycle yaw levels growing to approximately six degrees at 800 metres range. Originator- supplied keywords 5.56mm NATO Ammunition, Aerodynamic characteristicsd, Aerodynamic drag, Gyroscopic stability, Dynamic stability, Yaw limit-cycle, Accuracy.
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