64.
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.
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There is a possibility Nevill was just about out of bed when receiving his first two head shots. The rifle inches away.
Bamber being in attack mode & advancing for the first two shots. Then retreating to avoid a physical fight & firing two his torso shots from feet away.