As far as arrow weights go, my bow tells me when the arrow is too light because it starts getting louder. At 5.5 grains per pound, the arrow is fast, but I don't like how loud my bow sounds. At 7.5 grains per pound, she's whisper quiet and fast enough (260 fps) with a TON of KE. I've also found that with a slightly out of tune bow, fixed blade broadheads will fly alot better at 260 than 300 fps. Since I rarely take shots at deer past 25 yards, 260 is plenty fast for me.