the reason the trajectory is so similiar is the ballistic coefficient of the bullet. It's the same reason I shoot 180gr Nosler BT's and Accubonds out of my 300Win mag but I could get around 200fps more out of a 150 or 165gr bullet of the same style. Because of the better BC of the longer bullet though my trajectory is about the same, the heavier bullet sheds speed slower and the heavier bullet retains more energy downrange. Alot of guys get too wrapped up in velocity and what you'll eventually find is there is normally a middle point that gives you the best of both worlds. It's like the 460XVR being toted as the fastest revolver out there at 2300fps + but to me it's just an advertising gimmick. I know there are guys that like the 200gr Hornady ammo but the gun is more effective with 260 or 300gr bullets.