It was Sheila Caffel.
She misaligned inflicted flesh wound then figured where her brain was located.
It is far more likely Amanda Knox is guilty it is incomprehensible to me how anyone on ISF can believe in this appalling hoax.
So if it was Sheila Caffell......
..... one of the first questions to be addressed is: did she shoot everyone but herself with or without the silencer on the rifle? Because if she didn't, then whichever way round you order the killings, it's more-or-less impossible to conclude that some or all of the other family members would have woken with the sounds of the first shots in the sequence (an unsilenced .22 rifle, fired in a quiet house in the middle of the night, most certainly makes enough noise to travel through closed bedroom doors and induce a wake impulse).
Since June Bamber was out of her bed (but not by far) when she was shot, and Neville Bamber made it all the way downstairs, one might fairly guess - in a "Sheila did it, using an unsilenced rifle for all shots" scenario - that the children were shot first in their beds, and that June and Neville were woken by the shots. But there are big problems with that scenario. The biggest problem is related to the reloading of the rifle. Sheila would either have had to reload the rifle's magazine (for the first reload of two) in-between shooting the children and shooting June/Neville, or she'd have had to reload in the midst of the struggle with Neville. If the former, the elapsed time would raise issues just how and where June and Neville were confronted and shot; if the latter, Neville would almost-certainly have had enough time and ability to overpower Sheila. And that's before we even get to the fact that Sheila would have had to reload a
second time at some point as well.....
But if Sheila did it, while using a silencer for all the shots except the two which she inflicted upon herself (which would, on the face of it, fit far better with the positions of the bodies etc), then one would have to explain why she would have removed the silencer from the gun, placed it downstairs in the box, then shot herself. If, when she came to take her own life at the end, she had realised that she couldn't place the gun under her chin and reach the trigger with the silencer attached (as was the case), then why would she not simply have unscrewed the silencer and left it lying beside her? What possible reason could there have been for her to have gone to the trouble of replacing it into the box downstairs?
There are several other important questions, but perhaps I'll bring up two related ones in respect of the alleged phone call which Jeremy says was made to his (Jeremy's) house by Neville in the middle of Sheila's rampage: firstly, why on Earth would Neville have called Jeremy rather than 999, given the murderous circumstances (and, for that matter, why would Jeremy himself not immediately have called 999 when he received this alleged call from his father?)?
And secondly, Jeremy claimed that his father was speaking to him and then "the line went dead". Now, since in this scenario the calling party was White House Farm, and the called party was Jeremy's house, only two things could in reality have happened from Jeremy's perspective: either 1) Jeremy heard some sort of scuffle/shots/etc, and then heard silence - but the line remained open; or 2) someone terminated the call at the White House Farm end (either by pulling out the phone line or by depressing the handset cradle), in which case the line would have been closed and Jeremy would have heard the dial tone. What he COULDN'T have heard was a "dead line". Furthermore (and very importantly), if the line hadn't been terminated at the White House Farm end (as in (2) above), and Jeremy hadn't therefore heard the dial tone, he wouldn't have been able to make an outgoing call himself for 10 minutes - in 1985, the exchange would only hand you back your line in this situation after 10 minutes had elapsed. So Jeremy would have been unable to call the local police station from his house at the time when he did make that call.
(FWIW, my own view is that Jeremy placed a call from White House Farm to his own house as the very last thing he did before leaving the murder scene - I doubt he knew whether or not call records would be kept (in the event, they were not kept in those days). I also suspect that Julie Mugford was much deeper into this than she ever admitted* - I suspect that she was sitting at his place ready to answer the phone when he called from the farm house, so that there was evidence of the call having been placed and answered. I think Jeremy probably hung up the phone at White House Farm after making this call - thereby freeing up the line at his own place - and then decided to "dress" the scene more dramatically by taking the phone back off the hook and leaving it dangling. He then cycled back as fast as he could to his own place, whereupon he sent Julie back to her place and called the local police station (not knowing that it was only his having initially replaced the handset at the farmhouse which had freed up his own line to make that call...))
* And of course when Mugford eventually went to the police, she would have known that she could easily protect herself against impeachment in this sort of way, since her only threat was of Jeremy telling police she was far more deeply implicated than she was pretending - and she knew that could never happen, because Jeremy would necessarily implicate himself totally if he did go down that route.