Went to the range to day with a friend who is leaving in 12 days for an Elephant, Buffalo, and Lion hunt. He was shooting his .470 NE Chapuis offhand. As he fired a shot, the action opened, and the unfired round was ejected back into his face, cutting him on the face, just below his right eye. The case of the fired round was completely seperated @ 1/2 above the base of the case. The only thing we can surmise is that the action wasn't closed 100%, but that it was closed, just enough, to permit it to fire. It was quite a scary moment. What are your thoughts on what might have caused this?