Tracers Rounds (From SimHQ)

[ChrisDNT]

"Of course it the streaks lengthen as you move out to the x axis and they're moving so fast the eye behaves like a camera shudder creating glorified streaks."

In real life, this is exactly the contrary. The nearer the bullets are from you, you could perhaps see some kind of "light line" outside the canon tube, but when the bullets are far from you (especially true at around 800-1200 meters) the tracers look like dots moving quite slowly.