USED Barnes Bullets Rifle MPG 223/5.56 Caliber .224 55 GR Multi-Purpose Green. This bullet design features a highly frangible powdered-metal copper-tin core inside a guilding metal jacket. Unlike frangible bullets lacking a protective jacket MPG bullets remain intact under the rigors of handling feeding and firing in high capacity magazines. This eliminates the primary cause of jammed actions and plugged barrels often experienced when firing frangible ammunition in modern AR-style rifles. Minimizing run-out: Any variation in the centerline of the rifle bore the case and the bullet diminishes precision. Taking the time to ensure your sizing die is properly set up to produce cases with concentric necks will be worthwhile. A concentricity gauge will confirm that your finished ammunition is within a thousandth of an inch of perfect concentricity. Specifications for Barnes Bullets 30195 Rifle MPG 223/5.56 Caliber .224 55 GR Multi-Purpose Green: Manufacturer: Barnes Bullet Type: Frangible Bullet Weight: 55 grain Projectile Caliber: .22 Caliber .224 Caliber Sectional Density: 0.157 Bullet Quantity: 100 Bullet Lead Free: Yes Bullet Tip Material: Open Tip Weight: 355 grain Country of Origin: USA Fabric/Material: Brass Package Contents: Barnes Bullets 30195 Rifle MPG 223/5.56 Caliber .224 55 GR Multi-Purpose Green USED Barnes Bullets 30195 Rifle MPG 223/5.56 Caliber .224 55 GR Multi-Purpose Green