To start with, I'm relatively new to shooting. I just bought a Glock 19 and someone gave me several boxes of Federal American Eagle ammo. What is confusing me is the description on the box of ammo. It says 9mm Luger automatic pistol, 124 gr METAL CASE BULLET, No AE9AP. I know Federal makes AE9AP but I've never seen a box stamped Metal Case Bullet. I've seen FMJ, but not just Metal. I looked at several sites that sell this brand and the boxes look a little different. Is it possible these are just older bullets? Are they ok for target practice?