If you look on my website and click on the reference sheet, you will notice I tell people to not shoot anything less than 8 grains per pound. With high performance bows, you need the arrow weight to absorb the energy. Any less weight than that will be hard on a bow long term and you can pick up excess noise and vibration as well. I typically recommend 10 grains of arrow weight per pound of bow weight. With my bows you still get a pretty flat trajectory out to 25 yards, the bow is quiet, dead in the hand and you have an arrow with good KE. It just makes sense. I realize for shooting foam, guys will maybe want to go lighter but for hunting 10 grains per pound of bow weight and up, is hard to beat.