Peter Eaton said in his draft answers for the COLP interview that he had seen Shelia use and fire a gun at a holiday in Scotland. This was also mentioned at trial and the Dickinson Inquiry. There are many discrepancies in this area, Also there exists a Photo of Shelia holding a gun that David Boultflour sais he himself has seen.
https://drive.google.com/file/d/0B5DLsf0UggyWN1FEdlh5dUdRWkNfR0prdUJVclFldw/view?pref=2&pli=1
It's always been very flimsy that Sheila knew how to chamber, load and accurately fire the rifle, because she went on a shooting party, nine years earlier.
There is nothing saying she was taught how to load and chamber a rifle on this shooting party. Or that she even fired any bullets. If she did fire bullets, it would have been from a rifle already loaded for her.
She was 18 at the time, so doubtful anyone at the shooting party would teach her to load and chamber, or she was interested in learning. If a woman has shown no interest by the time she is 18, things won't change. And they didn't. She probably went along for a bit of fresh air and exercise.
CC said she had no experience of guns. Bamber testified she had 'limited' experience with guns. Which probably meant she fired a water pistol one summer. He couldn't say 'no' experience at court.
Sheila was in a mad rage. AE said she could see Sheila firing off ten bullets of an already loaded gun, but not chambering and re loading. She could barely put sugar into coffee.