Multiple shots in suicide cases happen frequently in US. In this case the pathological evidence shows it was a distinct possibility. If this wasn't the case Dr Vanezis would have raised during PM and instead of saying he found nothing to contradict the initial police theory of murder/suicide his feedback to the officers present at PM would have been entirely different.
Of course post trial he was more cautious saying had he seen SC at soc he would have raised certain issues which included the position of rifle and bible. But was before forensic scientist Martyn Ismail gave evidence at the 2002 appeal asserting SC was pulled down by her feet moving her head propped against the bedside cabinet which just happens to corroborate with A/PS Woodcock's WS. SC was moved at soc and the whole soc by way of her body, rifle and bible compromised which jurors and judge were unaware of.
Frequently with a semi automatic weapon? From what I have read, the phenomenon is rare and generally occurs when the shootist misses essential organs. As we know, the first shot would eventually have killed Sheila and the fact that it's clear she didn't move under her own steam, the likelihood of her re positioning and shooting herself twice, is pretty far fetched.
Are you saying that Vanezis became cautious as a matter of convenience?
I agree, SC was moved at the SOC, she was moved by Bamber as he looked for what he 'thought' would give the best impression on discovery.