Cor Bon Deep Penetrating X Bullet .300 AAC Blackout 200 grain Barnes XPB 20 Rounds Rifle Ammo. The reason is the homogenous solid copper projectile. Barrier blind is the new terminology for ammunition that outstandingly performs after penetrating a heavy barrier like auto glass or steel. DPX(R) is the only ammunition that maintains 100percent of its weight after going through such barriers. The DPX bullet is a 100percent solid copper bullet. Internal serration cuts have been added instead of traditional external serrations. These internal serration cuts allow the copper bullet to fully expand making the bullet double diameter with 6 razor sharp pedals. Specifications for Cor Bon Deep Penetrating X Bullet .300 AAC Blackout 200 grain Barnes XPB Rifle Ammunition: Manufacturer: Cor Bon Caliber: .300 AAC Blackout Number of Rounds: 20 Bullet Type: Barnes XPB Bullet Weight: 200 grain Package Contents: Cor Bon Deep Penetrating X Bullet .300 AAC Blackout 200 grain Barnes XPB Rifle Ammunition