Deduct 4 spent bullet cases (DRH/1, DRH/2, DRH/3, and DRH/4) from the batch of crime scene ammunition of the main bedroom, and you get 8 discounting the 13th bullet case found on the carpet of the top landing ( 12 - 4 = 8 ) - this confirms the shooting 7 times of June Bamber in that bedroom, and the shooting dead of Sheila once (1 bullet) there in the same bedroom! It is significant that the cops should seek to add 4 spent bullet cases to the main bedroom crime scene, and that this was the total of shots by which it was purported that Neville Bamber had already been shot four times in that bedroom long before he made his way downstairs to the kitchen!
I don't buy into it, they had to add 4 spent bullet cases into the main bedroom crime scene to make it fit - what becomes clear to me, is that in all likelihood Neville Bamber was shot at least 7 times downstairs in the kitchen, and possibly once as he was fleeing down the main stairs with the shooter on the top landing firing a shot at him as he fled downstairs...