I have a friend, Colin F., who worked for Holland & Holland in the 1980's as an apprentice. One of his jobs was regulating double rifles. He told me of a number of super works of art he had the pleasure of regulating. He had a 470 NE double of him and it broke his collar bone. It was due to a trigger flaw and he was not happy at all with the trigger smith who was responsible. It was enough to convince him to go back to school and get his engineering degree. He now is an engineering director of a company in London. His thought was that happening once in his lifetime was enough.