I was reading the court testimony of Mr Fletcher, and the issue of the missing cartridge case from the kitchen came up. One suggestion was that after Nevill was shot four times in the kitchen, the last cartridge jammed and was only ejected when the killer went back upstairs. Is that feasible?
If so, what is the other evidence that Nevill was shot on the stairs?
Also, the case was found quite near the main bedroom, which would suggest that the killer was heading for the main bedroom when he/she went back upstairs.