Has an AFL game ever ended 47-13?
Exactly once. On August 16, 1902, Melbourne beat Carlton 47-13, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 47-13 in league history.
That makes 47-13 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 48-13 has happened never and 47-14 has happened never.