Lightweight bows can handle whitetails quite effectively. But, if you can handle more draw weight without a loss in accuracy, you have the primary advantage of being able to shoot a heavier arrow for more penetration and the secondary advantage of getting a flatter trajectory. My own bow this season draws 65# @ my 25" draw. I have two sets of arrows...620 grain primary hunting arrows and 800 grain engine block tamers that I plan to use when hunting in close quarters. I have other bows I may switch hit with that draw 70# and 60#...depending on how cold it gets. :^)