depends on which ammo you use. Compare a .243 in hornady 100 gr light mag or the Federal 100 BT to a 6mil in remington core lockts and the .243 has the advantage, but then put a premium bullet in the 6 mil and then it takes the advantage back. The .243 Hornady Light mag has the exact same ballistics as the 6 mil in hornady's 100 gr SP, but the 6 mil in light mag takes the advantage again.