RWTF I came late to this thread, but the hit man in Bullitt was using a Winchester M97 in the hotel hit, and why wouldn't he be using the same in the car chase scene. That Winchester M97 must have been "Special Ordered" as it had shells in the magazine tube with the barrel off, as I remember, when he put it together. With my M97 you cannot take the barrel off with shells in the tube, and if you try and load the tube with the barrel off, they all run out on the floor. But hey, it's the movies,and Bullitt is also my favorite, and I believe the first modern movie to start all the "chase scenes" that followed.
Dennis

Dennis Potter