Why? Doesn't seem like you gain anything but a slightly flatter trajectory? Windage numbers are almost identical with a 6.5 140gr Hybrid at 2800fps vs a 6mm 105gr Hybrid at 3100fps. Seems like if you really wanted to improve in any significant way moving up to a 7mm with 180s would be the way to go. slightly flatter and slightly less recoil but more than likely harder on barrels isn't enough to persuade me into the 6mm. But different strokes for different folks I guess.