Israeli-made Dan .338From the Daily Caller:
In a stroke of irony, a sniper from the elite British Special Air Service (S.A.S.) took the head off an Islamic State leader who was teaching recruits how to behead prisoners.More here.
[...]“One minute he was standing there and the next his head had exploded. The commander remained standing upright for a couple of seconds before collapsing and that’s when panic set in. We later heard most of the recruits deserted.