I watched a TV movie last night of the CSI variety, which revolved
around twelve jurors, dismayed by a torturer/killer going
free, who conspired to train themselves to execute (!) a firing squad.
This program emanated from a country which does not
(publically) endorse state-sponsored torture, so there
was a dramatic element.
A policeman casually mentioned, the shooters would know which of
the twelve had the live round in the rifle - the recoil of course.
So here's the point that puzzled me: supposing that each round had
the same propellant charge, what would be the magnitude of the
recoil/difference?
I expect that it would be reasonable to have some numbers,
so let me pull these out of the air:
bullet: 0.030 kg
muzzle velocity: 500 m/s