Barnes Expander MZ Big Game Bullets .54 Caliber Flat Base 325 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 .54 Cal Rifle Bullets: Manufacturer: Barnes Bullet Type: Black Powder Projectile Caliber: .54 Caliber Quantity: 15 Condition: New Bullet Quantity: 15 Bullet Sectional Density: 0.211 Country of Origin: USA Features of Barnes Expander MZ Big Game .54 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 .54 Cal Rifle Bullets Barnes 30676: Expander MZ Big Game Bullets .54 Caliber Flat Base (FB) 325 grain 15 Bullets/Box Copper