X-Treme Bullets .45 ACP Caliber Pistol Bullets 250 Grain Round Nose 500 Bullets. Specifications for X-Treme Bullets .45 ACP Caliber Pistol Bullets 250 Grain Round Nose: Manufacturer: X-Treme Bullets Bullet Type: Round Nose (RN) Caliber: .45 ACP Cartridge Type: Brass Bullet Weight: 250 grain Projectile Caliber: .45 Caliber Diameter: 0.429 in Core Material: Lead Jacket Material: Copper Bullet Quantity: 500 Bullet Package Contents: X-Treme Bullets .45 ACP Caliber Pistol Bullets 250 Grain Round Nose X-Treme Bullets .45 ACP Caliber Pistol Bullets 250 Grain Round Nose 500 Bullets