I dont think there is a standard for what is accurate, each hunter has to find there own compfort level. Also depending on the game your hunting, on deer sized game i can shoot a constant 6 or 7 in group out to 25 yards, while i can shoot at gr8ter distance ill get alot of flyers and am not as constant, When shooting small game ill shoot at greater distance and often hit the mark or come real close I think the smaller target allows me to focus more.
Some guys are more constant closer other's at much greater distances, find a zone that works and try to expand it from there. we all arent going to be able to shoot like howard hill but we can have funn tryin.