Sounds like the work of a 5" twin with a gunner that knows his stuff.
And there is a 'tracer' for that, or rather the shell is visable. It just doesn't leave a smoke trail, and if it did it moves too fast for you to dodge it.
Best way to avoid carrier ack is to have a fast translational speed.IE You move more perpendicular to the gunner that parralell, causing you to move faster across his gun-sight, causing the gunner to have to pull more lead on you to hit, or just plain not be able to hit.
