Hello Everyone,this is my first post and I am not too clued up on computers,I have in my collection a solid brass projectile,it is 25mm,78mm long with copper driving bands,there are 3 driving bands,12 grooves with right hand twist,I bought this in Normandy last year at a ww2 Jeep spares shop,they did not know what it was or anything about it,any help identifying this would be most welcome,many thanks Don,