Ill inform you there is a thing such as accurate bow and arrow set up.At my local pro shop friend of mine made a mechanical bow shooter,bow companies have them. You could test bow or different bow and arrow combinations.You would have been surprized to see the results,like some brand new target arrows one would not group and you could check everything on arrow seemed fine,remove it no problem.Guys at our shop one was first to shoot 300 vegas way back when in comp. his shop.There is no such thing as an accurate bow. The bow just stores the energy to launch the arrow, accuracy is all down to the shooter. However some bows are more forgiving to shoot and Easier to shoot accurately.
James