KE is what you are looking to achieve.
Take the total mass of your hunting arrow and multiply it with your arrow velocity squared and divide that by 450,240. that will give you your arrows kinetic energy. keep in mind that 65 lbs of kinetic energy is enough to take on the largest of big game anywhere.
also keep in mind that, as important as weight of the arrow is, that any change in the spline to gain that weight could have drastic effects on your accuracy.
PSE 2006 FIRESTORM LITE #70
PSE 2009 TREESTAND GX #70
PSE 2010 1/2 AXE 6 #60
PSE 2011 EVO #70
The Devils Advocate