This has all been reviewed umpteen times by professional judges and found to be unfounded defence speculation .... Sheila could not have shot herself in the neck TWICE with a high powered rifle ..... the second shot perfect because she wasn't a moving target for Bamber.
That is my opinion!
Oh and it's the opinion of the jury, the judge, the police, the soco's, the cps, the appeal courts, the ccrc and all the family who knew Sheila and Bamber, Bamber's girlfriend, the twins father ...... and the public in general aren't exactly up in arms, protesting for Bamber to be freed are they!
Australian Suicide Shoots Himself 3 Times Before Expiring
"In February 1995, a death in parkland close to residential property in Canberra was reported to the Australian Federal Police. The body of a man had been found at the edge of a steep slope, about 150 metres from his home. He was lying on his left side with his head towards the top of a ridge. There was a lot of blood on his right shoulder and an obvious injury to the lower jaw and neck. A pump-action shotgun was lying about a metre from the body with the barrel facing up the slope, and a pair of shoes lay next to the gun. The action of the gun was open and contained a fired No. 2 shot shell case which had not been ejected. The muzzle end of the barrel was bloodstained and smudged, consistent with the barrel being held by both hands.
Initially, it appeared to be a straightforward shotgun suicide. When the body was turned over, however, two additional gunshot entry wounds were seen on the chest. To suicide was added the possibility of murder.
The police forensic team conducted a detailed search of the property (Box 1), finding a 12 gauge No. 2 shot shell cartridge on a sand pile near the rear stone wall of the property, with bloodstains on the ground nearby. Further examination of this area revealed shotgun pellet marks on the wall and some fragments of flesh. A second fired 12 gauge No. 2 shot shell cartridge case and an unfired cartridge were found on the ground close to a vehicle parked about 10 metres from the boundary of the property. A fragment of jaw with teeth and metal dental work and several bloodstains were found at this site, and a 12 gauge plastic shot shell wad was found 15 metres away.
Interpretation of the scene and autopsy findings
The most likely chain of events in this intriguing case was as follows.
The man had taken the shotgun, which measured 885 mm from muzzle to trigger, and loaded four 12 gauge No. 2 shot shell cartridges into the tubular magazine, cocked the weapon and loaded a cartridge from the magazine into the breech.
He then got into a stooped position near the sand pile adjacent to the rock wall of the backyard. The butt of the shotgun was most likely resting on the ground, with the gun held to the right of the deceased and the muzzle in contact with the centre of the chest. He used the fingers or thumb of the right hand to pull the trigger. The shot charge and wad entered the subcutaneous tissues at a low angle, travelled outside the rib cage, and exited on the left side of the chest. The remainder of the shot charge, wad and particulate matter then hit the rock retaining wall. The action of the shotgun was then cycled, ejecting the shell case onto the sand pile.
The man then walked to the vehicle. He loaded another cartridge from the magazine into the breech of the shotgun. Holding the shotgun to his right, with the left hand holding the barrel muzzle against his throat, he used the fingers or thumb of the right hand to pull the trigger. The shot charge and wad entered the right front side of his throat and exited on the left, taking a fragment of lower jaw with it.
After this second shot was fired, the shotgun most likely fell to the ground, where the action opened and ejected the shell case onto the ground. The impact also caused an unspent cartridge to fall out onto the ground.
The deceased then walked about 136 metres to the hill slope. He loaded the last cartridge from the magazine into the breech of the shotgun, then removed his shoes and lay on the ground on his left side. With the gun in front of him, he held the barrel with both hands, with the muzzle in contact with his chest. He used his toes to discharge the shotgun.
The shot and wad entered the lower chest area and penetrated up into the chest cavity, demolishing the heart. The shotgun then fell to the ground, causing the action to open. The body then slid a short distance down the slope.
At the coronial inquest, the Coroner and the lawyer representing the family of the deceased both attempted to replicate the man's supposed actions with the shotgun. The Coroner, some 20 cm taller than the deceased, with a longer reach, demonstrated that the barrel of the weapon was so long that, with a finger or thumb of the right hand on the trigger, the barrel could only contact the chest at an angle of about 45 degrees at best. Similarly, when the shotgun was held with its muzzle against the side of the neck, the barrel pointed forward and upward, as the right hand had to be a little to the rear of the body to press the trigger.
These demonstrations explained why the first two attempts were not fatal, while the increased reach obtained by using a toe on the trigger resulted in the immediately fatal third attempt. " http://www.mja.com.au/public/issues/173_11_041200/herdson/herdson.html 
