What is meant by 'perfect accounting'? Do you mean three or four or some other number?
How many shots do you think were fired in DP on that day?
Would you include the one from the stretcher or was that just a plant? I guess it does get confusing if you want to include the pristine bullet that rolled off the stretcher! I mean that "magic" bullet entered and exited 7 times and pretty much looks like it was pried off the end of a shell and left lying there as evidence to add to the sniper's nest cartridges found at that scene.
It looks like pretty convincing evidence if you want to steer your case in a particular direction and convicts someone in absentia.