I'm 99% certain that the spiralling effect in the tracer smoke is down to rifling of the barrel causing the rounds to spin, rather than any camera-shake effect.
I'm really happy that this effect is modelled (visible on many gun-camera films from this era), but as Oleg has said previously all different types of round are modelled - previous tracers showed simple light-streaks with no smoke. I have no doubt that all are modelled accurately.
I'm a little bit surprised at some of the reactions to the spiral tracer smoke though - when the previous tracers were shown there was a chorus of voices asking where was the smoke?!?
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