All right, I decided to help. It appears that the photo and connected question were placed into 2 totally separate threads. So here is the question from WaldFoerster:
have “unearthed” a tungsten carbide hard core from Bundeswehr times.
Weight approx. 3.6 kg; Length about 16.7 cm; Diameter about 4.7 cm.
Is it possibly “120mm APDS-T L1” of British forces?
The part looks very similar.
Who can help?