What a tracer should look like (before spazzing just look).

[yellonet]

Originally Posted by ElAurens

Exactly.

Bullets do have a trajectory in the form of an arc. They rise after exiting the barrel then fall off (down) after some distance (100s of yards in the case of rifles and heavy machine guns).

Bullets only rise because the barrel is pointing up, and there's no set distance for when the bullet drops below the aim point, that's up to bullet speed and how high you aim.

Originally Posted by ElAurens

Bullets do not curve to either side no matter how fast the barrel is traversing. Once it leaves the barrel it travels in a straight line.

They don't curve, but the sidewards motion of the barrel will be transferred to the bullet. If the bullet travels in direction x while being fired it will continue to do so after it leaves the barrel.