Sylvan , you are correct
It doesn't matter if you shoot a 330 grain arrow or a 530 grain arrow out of your bow - the initial kinetic energy (from 0-30 yards)that the arrow will have just won't be that much different (generally <4ft-lbs). If you don't believe me, get out the calculator and chrony.
Ture with the greater ke , coming from the heavery arrow . And that was the original posters question . In africa it makes a diferance , as the have minimum ke requirements .
Im haveing some trouble posting , if this reply shows up more than once .