Barnes Expander MZ Big Game Bullets .50 Caliber Flat Base 300 grain 15 Bullets/Box Copper. Barnes' Expander MZ Muzzleloader Bullets produce more consistent shot-to-shot velocities and better accuracy than competing bullets deliver. The result? Greater shooter confidence and more one-shot kills. Expander MZ bullets deliver deadly performance at both high and low velocities. Expand to twice their original diameter creating six razor-sharp copper petals that slice through game. No fragmentationthese tough deep-driving bullets typically retain 100 percent of their original weight. Specifications for Barnes Expander MZ Big Game .50 Cal Rifle Bullets: Manufacturer: Barnes Bullet Type: Black Powder Projectile Caliber: .50 Caliber Bullet Weight: 300 grain G7 Ballistic Coefficient: 0.207 Quantity: 15 Country of Origin: USA Features of Barnes Expander MZ Big Game .50 Cal Rifle Bullets 100percent Copper Exceptional Accuracy Full weight Retention Razor Sharp Cutting Edges Double-Diameter Expansion Deep Penetration Effective at High and Low Velocities No Fragmentation Recommended for In-Line Rif Package Contents: Barnes Expander MZ Big Game .50 Cal Rifle Bullets Barnes 30569: Expander MZ Big Game Bullets .50 Caliber Flat Base (FB) 300 grain 15 Bullets/Box Copper