Hypothesis:
The "tracer" part of the bullet burns inconsistently. One side burns in essence.
The bullet is spiraling like an American football.
So if only one side of the tracer is "burning", the effect would be the spiral smoke trails we see.
I dunno. Just a thought. I have never seen tracer smoke trails in real life and I am guessing it only occurs on some older ammo. I think the oldest tracer ammo I have fired was from Korea and it certainly was not in .303.
Splitter
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