From the trajectory of the shots the head and jaw shots appear to be in pairs. In my opinion, it would be unlikely that 2 shots could by chance have the same trajectory had they not been fired in close succession.
It should read: 'Found in or just outside the bedroom were 14 cartridge cases.' 7 to June, 2 to Sheila and 5 to Ralph. This would mean at least 2 head shots in the bedroom.
Hi Lebaleb Nice to see you posting again
It is likely that one case shell had been transferred under the boot of one of the raid team from the kitchen. However, this miraculously dropped off in the main bedroom. One would have to know what kind of boots they were wearing in order to come to this conclusion, but on saying that it is possible for this to have happened, but this can't be proved.
3 shell cases on the kitchen would mean that Neville sustained fatal shots there and one fatal shot in the bedroom. This of course would mean that Neville had been carried downstairs by the killer and there were no struggle near the sink or any where else in the kitchen.

KITCHEN
DRH/41 case...under kitchen table
DRH/ 19 case...on kitchen table
DRH/20 case....under the mat, infront of sink
DRH/23 bullet.....in a plastic tray on worktop near sink unit.
LANDING
DRH/14...landing floor adjacent to the wall.
MAIN BEDROOM
DRH/13 metal strip of doorway
DRH/6 top of quit right hand side of the bed
DRH/7 under wardrobe
DRH/7 under wardrobe (note Hammersley quotes two cases found under same serial number DRH7
DRH/8 left hand side of bed 4inches from the pillow
DRH/9 Bullet found 4 inches form DRH/8 near pillow left hand side of bed
DRH/10 on the quilt right hand side of the bed on floor.
DRH/11 right hand side of bed on the floor near the wardrobe
DRH/12 on the floor right hand side of the bed
DRH/43 under the wardrobe right hand side of bed
DRH/1 right side of Sheila's body
DRH/2 Left hand side of Sheila's body
DRH/3 on the floor inside the door of the main bedroom to the left of June's body.
DRH/4 next to DRH/3
DRH/5 Bullet.
TWINS ROOM
8 cases and 1 bullet.
DRH/37 under wooden bedside cabinet
DRH/36 Bullet
DRH/38 Under right hand side of the bed at the head of the bed
DRH 39 right hand corner under right hand side of the bed
DRH/39 (note Hammersley quotes two case shells)
DRH 40 under the middle of the right hand bed
DRH/16 floor between both beds
DRH/17 On wooden cabinet between both beds
DRH18 right hand side of bed