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If you use the formula for discovering K.E.,you will find that K.E. changes very little at all with weight of the arrow.
It is more important to shoot the correct bow weight than to fool with grs. per. pound in arrow weight.
There is a reason that states provide for a minimum bow weight for hunting and do not refer to arrow weight...
As far as being "A FOOL", it is better to keep one's mouth closed and be considered a fool than to open it and remove all doubt!
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YES, the bow weight is more important - but once you have chosen a bow weight, you still must choose an arrow.
YES, the initial KE is almost the same, It is only different because of the differing dynamic efficiencies of the bow. It is my belief that this change will be about 10% or a little bit better improvement when going to the 9 grain per pound arrow from a 5 grain per pound arrow.
But the heavier arrow also slows down less on the way to its target.
And it is momentum that leads to penetration, the momentum of the heavier arrow is more.
I am playing the fool a little - I believe that a person can be an ethical hunter at 7 or 6 or even 5 grains per pound, but I think that if we beat this to death we will come to a concensus that going to 9 grains per pound would decrease the number of wounded deer...
beprepn