So just reviewing the bullet casings again. It makes no sense that Jeremy fired loads of shots into Sheila's half of the bed and none into Nevill's. The person he most needed to incapacitate was Nevill. What is more, it is clear the killer was standing either in the doorway or at the foot of the bed with the gun pointed at June, thus leaving themselves exposed to counter attack by Nevill on their left hand side - but instead he got past and ran downstairs. If Nevill had been been in bed, Bamber would have at least alternated who he shot instead of pumping 8 into June and none into Nevill. So Nevill can't have been in bed? The rifle was a semi-auto, so bullets were fired in quick succession - "bang, bang, bang, bang, bang"... five into June's body as she lay in bed, or maybe "bang, bang"... as she lay with her head on the pillow, then "bang, bang, bang"... three more as she struggled to get up. Then "bang, bang, bang, bang"... four shots at Nevill as he was getting up and out of bed to retaliate or escape the onslaught. But as you say, Bamber might have alternated all those nine shots between the two victims.
After the fight in the kitchen, he returned upstairs to finish off June with two more head shots as she lay in the doorway, hence DRH 13 and DRH 14 casings assigned to her ending up on the landing and down the first flight of stairs.
Rapid firing of an Anschutz 525...
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