Here is a nice web site for a chart to aid in setting your sight pins....If you get any two pins set, you can use this chart (sight-cal-300) to set the rest....This chart really works.......http://www.centenaryarchers.gil.com.....htm#Calibrate your Sight

I bet you' ll be grouping in a 6" circle at 30 yards rather than 30' (feet) by October!
If your sights are tight and not loose, any error in your shooting will be due to you and not the pins. Try drawing your bow but let someone else pull the trigger on your release..........to your surprise, you will never miss your target.........Most errors are from improper releasing.......