A lot has been made of the lack of injuries to Sheila
A lot has been made of a load of rubbish, imho.

And there are more. And both both Nevill and June had wounds also.
In order to prosecute Jeremy, they first had to ensure that any evidence of a fight between Sheila / Nevill / June was omitted. This was done in varying ways: outright omission of wounds from the record (e.g. June's chin); attributing wounds to another cause (e.g. when the marks on Nevill's arm came to light); and passing off wounds as 'smears' or 'smearing'.
Sheila even has a mark on the outside of her forefinger (see base of finger) consistent in shape with a machined part of the Anschutz. At trial when questioned, Peter Vanezizs claims he is not sure what this is and that from the larger photo shown in court, it may be smearing.
How can Peter Vanezis - a pathologist with a body in front of him, not know what the mark is on the base of the forefinger of her right hand, which had been found draped across the rifle? At that point in time, he had on the table in front of him, the corpse of the sole suspect in a multiple shooting incident. Not just the prime suspect - the
only suspect. He even went on record in some form, expressing that he was distinctly unimpressed with DS Stan Jones' later theory that Jeremy was the killer.
How can he then appear in a courtroom and profess not to know what the mark was? His questioning in this matter was choreographed, imo.
Then there's the small matter of Jeremy's lack of wounds. An inheritance killer, who using a weapon designed for shooting small mamals, attempts to kill three adults, any of whom could have fought to protect the twins. If he sustains just one notable injury in the ensuing incident, his whole plan would collapse with immediate effect.