Swift A-Frame Heavy Revolver 45 Caliber .452 300 GR Hollow Point HP 50. 452 300 GR Hollow Point (HP) 50 - Swift Bullets' A-Frame bullets combine full metal jacket penetration with controlled expansion. Each rounds uses a bonded core. The front half of the bullet is made up of copper clad with lead core and a bonded core. The rear half is copper clad with a lead core and includes a hollow point. When the bullet begins to expand it will begin to mushroom and gain diameter until the energy is transferred to the copper jacket from the lead core. No matter how you look at it you can't find an A-Frame bullet without an SBT . The SBB represents the highest BC weight and overall diameter offered in the A-Frame line. These bullets have been extensively tested and are some of the most accurate and consistent in the industry. Specifications for Swift 453004 A-Frame Heavy Revolver 45 Caliber .452 300 GR Hollow Point (HP) 50: Manufacturer: Swift Bullet Company Bullet Type: Hollow Point (HP) Bullet Weight: 300 grain Sectional Density: 0.21 Projectile Caliber: .45 Caliber Bullet Quantity: 50 Bullet Fabric/Material: Copper Package Contents: Swift 453004 A-Frame Heavy Revolver 45 Caliber .452 300 GR Hollow Point (HP) 50 Swift 453004 A-Frame Heavy Revolver 45 Caliber .452 300 GR Hollow Point HP 50