Has an AFL game ever ended 103-30?
Exactly once. On August 16, 1947, Carlton beat St Kilda 103-30, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 103-30 in league history.
That makes 103-30 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 104-30 has happened never and 103-31 has happened never.