Is there a realistic tracer mod?

[Osprey]

Meaker isn't talking about a rattling camera making the tracer appear to zig zag. He's referring to the smoke trails left by tracer rounds (I am not sure which ones). They spiral because the round spins and the smoke ejection is on the outside edge of the round.

I don't know which type of bullets these were but I have seen the footage myself, BoB guncam stuff firing at He111's. It's definitely smoke, I can't see how it's vapour because it's not on every round. I think someone needs to scour youtube for some demonstration footage.

[CWMV]

Ya I think weve all seen similar effects from german aircraft on strafing runs.
Curious about what exactly causes it.