Well I don't agree with Adam on this, at close range the rifle was lethal, JB could have committed the crime with just five shots, but this would have looked suspicious. He could have used nine or ten shots and I don't think anyone would have questioned this?
He was high on drugs at the time, just as David Bain was in one of his manufactured trances enabled by his mother's tutelage on the subject. He would later tell Julie he had had a "
mental blank", which is as good a description as any to depict the circumstances of the carnage inflicted that night.