Barnes Bullets Expander MZ 50 Black Powder Expander MZ 300 GR 24. 211 and ballistic coefficient of 0.207. These bullets are popular among seasoned hunters who look for confidence and one-shot kill ability in their ammunition. The bullets offer improved velocities and enhanced accuracy over competing bullets. At both low and high velocities these bullets can deliver deadly force. In addition they are made to expand to twice the original diameter which ultimately creates copper petals that are razor sharp and able to cut through large game with no fragmentation. Specifications for Barnes Bullets 30583 Expander MZ 50 Black Powder Expander MZ 300 GR 24: Manufacturer: Barnes Bullet Type: Black Powder Projectile Caliber: .50 Caliber Bullet Weight: 300 grain Quantity: 24 Lead Free: Yes Sectional Density: 0.211 Country of Origin: USA Package Contents: Barnes Bullets 30583 Expander MZ 50 Black Powder Expander MZ 300 GR 24 Barnes Bullets 30583 Expander MZ 50 Black Powder Expander MZ 300 GR 24