I conceded because to do so by agreeing that the rifle was at the box room window, rather than the main bedroom favours Bambers innocent more, than if 'it' was resting at the main bedroom window - it had to travel further before it ended up inevitibly on top of Sheila's body as per photo's 26, 27, 28, 29, 30, 31, 32 and 33...
I am not saying the rifle seen by Jeapes and photographed in the bedroom was the same rifle on Shelia's body. I am suggesting there could have been two rifles involved, so you have one rifle across Shelia's body and at the same time another rifle by the main bedroom window.
I don't know why people who believe Jeremy is guilty are so closed minded about this possibility because if you are to believe Jeremy planned and engineered the mass murder it would make sense for him to conceal another rifle in the farm somewhere to grab as backup and not have to reload.