need some help with these,my lad collected them at a target ship on a sandbank.he only just started collecting(7 year old).picked up .50 cal cases with usa ww2 head stamps aswell.think they must have been fired from a plane?.he would like to know wot sort they are ap ,tracer etc.have gained a bit of info from this site but some links about .50cal ww2 would help.he also collected .303 bullets and cases ww2 aswell,i know RAF sutton bridge was a gunnery training station with spitfires in ww2,only about 3 miles away.will post them later....thanks