okay my two pennies. First, intresting question and 2nd alot of good discussion. Myself, I believe you are only limited to the cast of which your bow will perform. A guy on here said a true statement, "I know when you shoot an arrow straight up it doesn't come down as quick". Obvious, yes, and so true. And "Bullet kills, with shock, arrow with hemoragge, cuts". So, yes at distance you will loose "energy", and the flight will slow, to the point where GRAVITY (belive 32#) pulls the arrow back down. So you will have an razor sharp blade coming down at a minimum of 32# (shoot a bow 32# and see penatration pretty good). Now, take in, that once that RAZOR sharp blade comes into contact with tissue/body, the weight of the arrow will assist in the penatration, untill stopped by a hard mass (even then dumps energy as a bullet does) or cuts till out of energy. Will our "typical" tackle today, I belive you could CAST arrow to 200, accuracy of course is issue as alot more mass for wind to push around. Two finaly things, One, the "old timer" bowhunters would rate the arrow performance and bow with casting or shooting at far distance, then select the groups of arrows to hunt with. Two, The old WAR Bow's was taller than a man and drew 150# (I belive, someone on here knows more than I on this) and shot a huge shaft to get the arrow at least half way (gravity on the other half) to also keep mass weight for cutting threw armor. Just my humble opinion. Semper Fi