One of the more interesting cartridges I have sectioned. If you look closely at the projectile, you will notice that there is no lead at all in it. Just a steel core and a thick brass jacket. Usually in an AP projectile, there is a thin layer of lead between the jacket and core to allow the rifling to engrave when the projectile is fired, and a bit of lead in the tip of the jacket. The cartridge is un-headstamped, so I can not tell when it was made, nor do I know if this is the only variation of the AP load. ID is by black case mouth seal.