840rd can of 55gr 5.56NATO FMJ-BT ammo from PMC Ammunition. MPN 5.56X (M/B) Bullet Type: FMJ-BT Weight: 55 grain Velocity (feet per second)   Muzzle: 3270 100 Yds: 2898 200 Yds: 2555 300 Yds: 2237 400 Yds: 1943 500 Yds: 1674 Energy (foot-pounds)   Muzzle: 1306 Bullet Path (inches)   Muzzle: -1.50 100 Yds: 0 200 Yds: -2.6 300 Yds: -10.6 400 Yds: -25.6 500 Yds: -49.9 Ballistic Coefficient 0.243 Bullet Length 0.740 Sectional Density 0.156