55gr 5.56 NATO FMJ-BT ammo from PMC Ammunition.

MPN 5.56X

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