Has an AFL game ever ended 30-23?
Exactly once. On September 3, 1927, Carlton beat Richmond 30-23, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 30-23 in league history.
That makes 30-23 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 31-23 has happened never and 30-24 has happened 1 times.