Has anyone read Mike's latest theorising called So and so, said so...?
Another classic Sheila done it scenario this time with a twist. Apparently she leant the rifle on the 'hot' Aga oven while reloading and before shooting Nevill again. According to Mike this is how Nevill got the burn marks on the back of his neck.
Lets see >@@(*&) Hot Aga? ...at 3am in a balmy August morning? I know a lot of people who have kitchen stoves and not one of them runs a stove 24/7 in the months of July and August. Even if the Aga was on and warm at 3am in the morning it would not have been hot and most certainly never hot enough to super heat the tip of a rifle for any length of time.
Only the police, possibly Barbara Wilson or Jean Bouttell and Jeremy Bamber himself would have known if the AGA was lit that morning. (vidvic may know through his contact with the family)
But assuming it was coke-fired and alight on idle, even if the rifle end wasn't used, another implement such as one hung up on the right could have been used to remove the filler plug in the boiling plate and then inserted in the combustion chamber or inserted through the lower fire door. It wouldn't have taken very long to bring it up to branding temperature and used to inflict the marks, to test if he was still alive or simply for malicious intent.
If it was for the first reason it begs the question as to why he didn't feel for a wrist pulse. Maybe he didn't know how..., or it didn't cross his mind..., or he was mindful of leaving blooded fingerprint evidence.

Perhaps Shona could be on the right tack with them being caused by contact with hot farm machinery... who knows?
Even if it is eventually proved that the rifle end was responsible it doesn't necessarily follow that the moderator wasn't fitted at all that morning.