QUOTE: "now take same bow, same draw length, just change arrow weight and shoot, you will get slower speed but KE will always,I repeat always, be more. and the heavier the arrow gets the more KE you will get, even though it is going slower. You will need a Chronographs to measure the speed at the bow and and grain Scales to measure the weight of the arrow."


Bees,
You are absolutly correct, but take this into consideration:
a 300g arrow produced speeds of 273fps and energy of 49.66 ft-lbs
a 600g arrow produced speeds of 201fps and energy of 54.16 ft-lbs
that means velocity loss = 26.2% and kinetic enery gains= 8.3%
Those are huge losses for minimal gains.
(actuall test may be viewed at: http://www.dundeesportsmansclub.com/dundee%20pic/dundeesportsmansclubinc.compoundbowselectionguide. htm#ketest)

Additionally I personally went from a 447g arrow (speeds of 248fps) to a 369g arrow (speeds of 269) and a loss ofonly 2ft-lb of energy, from 61ft-lbs to 59ft-lbs. But at thirty yards my window to miscalculate yardage went from 3yds (above or below) to 6yds (above or below) still hitting the kill zone.

The old addage "fast miss/Slow kill" doesn't hold water. The extra speed gives me a wider margin for error in estimating yardage! And the kinetic energy? PAALEEEASE! I can drop down to 40ft-lbs and still kill a deer.