Free: Contests & Raffles.
I don't group my arrrows as it gets to expensive when you shoot off fletching, robin hood arrows or fracture the other shafts. I shoot a 5 dot target usually and try to take out the dots. This also makes it a lot easier to pull the arrow out when they are not in a tight group.
Chuck Adams says that at 20yds your group should be at no larger than 2". Then for every increase of ten yds add an inch to that. So for example your groups should look like this. My max effective range for me is the farthest distance I can put 95% of my arrows inside of a 6" circle. 10yds = 1"20yds = 2"30yds = 3"40yds = 4"50yds = 5" etc.