Barnes® .50 Caliber Expander™ Hollow Point Muzzleloader Bullets - 250-300 GrainsThe Barnes Expander Hollow Point Flat Base Muzzleloader Bullets are the muzzleloader equivalent of the X Bullet. The Barnes Expanders are 100 percent copper with a large, hollow cavity for quick and true expansion. The newly, redesigned sabots reduce ramrod pressure needed to load and seat your bullets. The Barnes Expander MZ Bullets produce more consistent shot to shot velocities and better accuracy than most competing bullets on the market. Barnes