The energy is the ONLY thing that is relevant when comparing trajectory.What do you think makes it fly? You transfer energy from the bow to the arrow.


Do the test that Arthur suggest and then try the miss difference test.Shoot your bow as is for 40 yards at 45.Then set up a 460 grain arrow and then do the same.I believe there will beLESS than a 2" difference with a 100 gr difference in arrow weight.


The only way spine was ok for both is if the arrow was slightly stiff for one and slightly weak for the other.This is definately possible.