Hornady Full Metal Jacket Bullets are designed so that the bullet is completely encased in a hard metal jacket (except for the base), which is not intended to expand upon impact. Hornady FMJ bullets are built with a rugged AMP bullet jacket (Advanced Manufacturing Process) that clearly delivers better performance. The thin-plated full metal jacket offered by other manufacturers is easily distorted and often breaks or separates when the bullet impacts the target. The Hornady AMP bullet jacket features virtually zero tolerance for concentricity and near-zero wall thickness variation, punching through targets without deforming or breaking. These bullets are primarily used for target shooting and plinking. This is not loaded ammunition.