In 1958 the targets on the 500 yard (not meters) had a 20" round bulls eye. I used a M1 Grand 30-06 with open iron sights and shot a 45 out of 50 with 10 rounds.
I qualified Expert with an M-1 at Parris Island in September 1962. The 500 yard targets were roughly 6 feet X 6 feet.
Interesting on the timelines vs. rifles used for marksman qualification.
Seems to me both the M1 and M14 were fully up to the task. I am a fan of both.
Hay question,how big are y'all's rifle quality targets ?
Was your question of current or historical standard target sizes?