The Barnes MZ muzzleloader bullets are known for their consistency and match-grade accuracy. On impact, these deadly all-copper bullets expand into six razor-sharp petals at velocities as low as 1,100 fps. Unique solid rear shank construction maintains the bullet's integrity, producing virtually 100 percent weight retention even at higher velocities. Deep penetration, reliable controlled expansion and unbeatable terminal performance are hallmarks of this muzzleloading version of the famed Barnes X-Bullet.