Upward facing three vent holes on top face of gun, was gun contaminated, with some of Sheila's blood from running blood that was present on her hands?
If blood leaked into the internal mechanism of the Bamber rifle when someone placed her bloodstained hand and fingers on the gun in time for PC Bird to take his crime scene photographs, and it dried internally - would it be possible for some of that blood to be innocently blasted out of the gun during test firing of the gun and silencer with control ammunition, and would this account, or could this account for the presence or otherwise of a small dried flake of blood that was found in the silencer by the ballistics expert, Fletcher after 30th August 1985?