I stumbled across a web address that is a dissertation of sorts by somebody and the file is a .pdf. It is a study of ballistics apparently (in German), and on pages 30 - 35 it shows some really neat section work done of the RUAG and MEN action-type projectiles.
Some all brass, some all copper, with several HP variants. Further on in the study you can see photos of how they set up a dead pig in a leather jacket, put it in a vehicle, and then shot through the glass into the pig. Sounds like “Mythbusters” type stuff to me.