I am looking for an ID on this cartridge, I have now seen several of them for sale but cannot find an ID.
It’s in an Oerlikon manufactured steel case (unfortunately a previous owner decided to try and remove the primer…). The projectile is only marked “APP” and shaped like an APDS / TPDS projectile, perhaps Armor Piercing Practice? The body is aluminum with sintered iron drive band and a magnetic nose cap (unknown metal), it has a small gap between the projectile body and nose although the nose does not come off or move (tried to picture in the 3rd photo). It does not appear to be an actual discarding sabot projectile however.
Does anyone know what this is? Thanks in advance!