Going through a bag of pointless crap recovered over the years I found the ammunition shown in this picture. The rounds are bigger than .303 but significantly smaller than .50, they date from WW1 or just before and were found by the hundred scattered inside a wreck from 1917. For sizing purposes I have photographed them next to a 20mm case. The point that I found very interesting is that they are almost shoulderless. On the bottom they are marked "R L" with the crow's foot/arrow between the two letters. Has anyone got a clue what calibre they are, what weapon they were for?