From the 2002 appeal.
60. Found in or just outside the bedroom were thirteen cartridge cases. Seven would account for the shots into June Bamber, two for the wounds suffered by Sheila Caffell, leaving four cartridge cases that had been fired at Nevill Bamber. Three further cartridge cases were found in the kitchen, with a further case on the stairs leading up from the kitchen.
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.
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The two close range head shots to Nevill were when he was getting out of bed.
The other two body shots were when Nevill was standing up & moving towards the door. Bamber moving backwards to avoid physical confrontation but continuing to fire until out of bullets.