Come on guys. everybody's comments seem to have some sort of truth to them, but KE is just an analytical measurement of the energy you have to work with (whatenergy the arrow has to work with at impact). Impact depth, pass thru. etc. are all effected, by "other things" (how efficiently the arrow transfers or does not transferthis energy to the target). Lets face it, if you have pasthru, strickly speaking all the energy was not transferred to the target, if this was good enough for a kill or not you guys would know better than me.
There is another item that I am interested in (which was briefly mentioned in some of the previous post)andwill be specific to a particular bow and that is if the bow "transfer to arrow" efficiency is indeed a curve (to a point where the slope changes which should indicate max. efficiency) or does the energy efficiency in the transfer just keep going up as you make the arrow heavier and heavier.