Has an Olympic Soccer (Men) game ever ended 6-3?
Yes. Olympic Soccer (Men) has seen a final score of 6-3 2 times. It first happened on June 2, 1928, when Argentina beat Belgium, and most recently on June 2, 1928, when Argentina beat Belgium.
That makes 6-3 the 17th most common final score out of 27 that have ever occurred in Olympic Soccer (Men). One point away, 7-3 has happened never and 6-4 has happened never.