Dear all -- Completely new to this forum, not into firearms myself but am interested in getting some opinions for historical reasons. Here is my question: While working in southeastern Europe recently I came across a bullet casing (right term?) from a spent cartridge that I suspect is WWII era. Other objects from the same site include a cartridge with a "WRA 1943 .303" headstamp and military debris that can be identified as German or British. I attach here a scaled drawing of the object. Can anyone help me identify it? My questions are:
1) What is the manufacturing mark, and what does it tell me in terms of factory and year?
2) What type of gun would have fired such a bullet?
Many thanks, and apologies for my ignorance and any misuse of terms!