Firstly, if Sheila was 'so easy to control' and this 'benefited Bamber' - how was he unable to correctly shoot her on the first occasion? The most crucial shot he had to make that night - and he couldn't even control her properly or aim it properly. He also knowingly risked having to shoot her more than once -because he knowingly used a low calibre weapon intended for killing vermin.
What rubbish.
What weapon should he have used ?
The second shot was in the exact same position as the first. It was impossible for Sheila to shoot herself twice. Bamber accepted this when interviewed by the police.
Yours & TomG's suggestion that the police fired the second shot after Sheila had been prononced dead, has been dismissed.
Bamber & PB confirmed Sheila was zonked out on the night & going to bed. There is no possibility she could have committed the massacre due to the Haloperidol. You know this.