Barnes Bullets XPB 454 Casull .451 250 GR XPB 20 Box. The XPB all-copper X Bullet expands on impact more aggressively than D-type bullets which makes them much more suitable for handgun hunting. These bullets track well at all velocities and demonstrate excellent accuracy and energy retention on a variety of game. This bullet may be a little flexy depending on your barrel. If this is your first experience using our store brand you might want to start with the 30562 XPB 454 Casull .451 250 GR XPB 20 Box. Specifications for Barnes Bullets 30562 XPB 454 Casull .451 250 GR XPB 20 Box: Manufacturer: Barnes Bullet Type: Hollow Point (HP) Jacketed Hollow Point (JHP) Bullet Weight: 250 grain Sectional Density: 0.176 Projectile Caliber: .451 Caliber Bullet Quantity: 20 Bullet Country of Origin: USA Housing/Frame Material: Copper Fabric/Material: Copper Package Contents: Barnes Bullets 30562 XPB 454 Casull .451 250 GR XPB 20 Box Barnes Bullets 30562 XPB 454 Casull .451 250 GR XPB 20 Box