[the other guys are right as i browsed their replies...
this is an obsession for most of us....then there are the guys that only pull there bow out just before season.
once you are set up get out to as many 3d shoots as you can this helps in range guessing and getting to know your equipment...
I have not had a problem with point of impact between broad heads and feild points till this year. the doe was 45 yards away the arrow has more forward of center which drop abit sooner then expected...the second arrow didn't miss. get out there shoot and have fun.....