Armor piercing bullets have a steel core, instead of a lead core. Usually the bullet itself has a coat of paint, green or black usually, on it. But, after so many years, it rubs off. Easiest way to tell if it's steel core, is to take a magnet to the bullet. If it sticks, or pulls, it's got a steel core. Some of your imported ammo, has got a steel core. I've noticed alot of 7.62x54r ammo has the steel core. I had thought that at one time, that ap ammo was outlawed, because it had been proven to go thru bullet proof vests. But there is so much out there now, they either changed the law, or it really wasn't a law, just a ''rumor''. gypsyman