Winchester Rifle Bullets 5.56x45mm NATO .224 55 GrainFull Metal Jacket 500 Bullets. And each and every component is made to meet and exceed the most demanding quality control and performance standards in the industry - Winchester's Specifications for Winchester Rifle Bullets 5.56x45mm NATO 55 Grain Full Metal Jacket: Manufacturer: Winchester Gun Type: Rifle Bullet Type: Full Metal Jacket Boat Tail (FMJBT) Full Metal Jacket (FMJ) Caliber: 5.56x45mm NATO Bullet Weight: 55 grain Projectile Caliber: .224 Caliber Core Material: Lead Bullet Quantity: 500 Bullet Fabric/Material: Copper Features of Winchester Rifle Bullets 5.56x45mm NATO 55 Grain Full Metal Jacket Bullets are custom-designed and manufactured to precise specifications to deliver specific on-target performance characteristics These characterisics vary depending on bullet design Winchester carries a variety of component bullets for both centerfire rifle and handgun ammunition Package Contents: Winchester Rifle Bullets 5.56x45mm NATO 55 Grain Full Metal Jacket Winchester WB556MC55D-224CAL: Rifle Bullets 5.56x45mm NATO .224 55 GrainFull Metal Jacket 500 Bullets