Actually challenge clone was correct.
There should be rounds in between the tracers, but it got to be too many rounds for the system to keep track of, was significantly impacting gameplay. So they juggled it, removed the unseen rounds and cranked up the damage of the tracer rounds if they hit.
Also there are no .30 or .50 cal mg acks in game, have not been for a long time now. Same problem as above.
They went with fewer larger caliber guns.
If you don't believe me its not that hard to test with the manned guns.
So yes, 37mm impacting tank on the same location will blow through in time. Stay out of the ack, kill it first, then move in.