Some 7,9 Mauser WW2 rounds are programmed to self-destruction after a couple of years.
Until now I did not found out the programming of this phenomenon. It started about 40 years ago. It seems to be the German state during WW2 did everything to confuse me now.
It is not only seen by German rounds, but also by this example made by “am”, (Hirtenberg) a factory in Austria who is normally makes high quality ammunition.
Here an example of the 7,9 self-destruction.
A smiling Dutch