.22 snap cap like (or even a cartridge ?)(answered !)

another to stump Fede (which seems impossible)

6.3 dia; 19.0 length

light spring loaded flat end…impresses 4 =/- mm

crowned other end

look here…

very down in the page…answer from Fede…voila

Greetings

Peter

bingo…another one bites the dust

thanks

A tip makes one open a drawer and a “box” not opened before 🤨