I'm with dwd on this one. When I went with lighter arrows I didn't get the results I was used to when shooting deer. Went back to a set up of med weight and I was happy again. I spined a deer(not intended placement so no ethics police needed)this year at 30 yards and still penatrated one lung completely. Arrow was 3/4 buried. I was shooting a 2006Alegence at 275 fps and everyoneknows what that bow is capable of as far as speed so I was way below what it can shoot because I chose a heavier arrow.