Comment by Zibulon

Actually not so hard - below 30 meters, you can have that kind of accuracy with not too much effort IMHO - in recurve archery, we shoot only 3 arrows, on separate targets, starting at 50 meters, to avoid breaking arrows (the next one hitting the preceding one). At 30 meters, I can let go of sight and a lot of technique and still be "bullseye" as he is.