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-5.56MM NATO-FMJ-BT-55 grainBallistics (20"barrel length)Velocity (feet per second) Muzzle:3270 100 Yds:2898 200 Yds:2555 300 Yds:2237 400 Yds:1943 500 Yds: 1674Energy (foot-pounds) Muzzle: 1306Ballistic Coefficient 0.243Bullet Length 0.740Sectional Density 0.156
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