Has an AFL game ever ended 113-51?
Exactly once. On July 24, 2011, Geelong beat Richmond 113-51, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 113-51 in league history.
That makes 113-51 the 3884th most common final score out of 6,649 that have ever occurred in AFL. One point away, 114-51 has happened 2 times and 113-52 has happened 3 times.