Not sure how much simpler I can make it.
Its hard to tell the exact location of the shots to Neville, but this is the official version anyway.
If one accepts that the four shots to the head which would have immobilised and killed Nevill Bamber were fired in the kitchen where his body was recovered, it would follow that he had received the less serious injuries upstairs in the bedroom and was then able to make his way downstairs where he was subsequently killed.
In respect of the eight shots into Nevill Bamber’s body, the six to his head and face were fired when the rifle was within a few inches of the skin. The remaining injuries to the arm were caused when the gun was at least two feet from the body.
So the rifle was within inches for six shots and the shell casings were found in the bedroom and kitchen with one on the stairs.