Originally Posted by Hntbambi
Actually, the heavy 7mm bullets (180+ gr) will give you better downrange numbers than the 6.5mm. The benefit of the 6.5mm is the bullet is lighter (140 gr) so you get less recoil.
No the 6.5 gives you much higher ballistic coefficients so you have better long range peformance in both accuracy and retained velocity.
A great example comes from comparing the .260 140 gr to the .300 wm 180gr.
At a thousand yards using standard loads you have 110 inchess less drop from the .260.
Pull up a ballistic calculator and compare long range performance between 7mm and 6.5 using standard loads and you will see similar results. The Higher BC of the 6.5 is more stable, and retains velocity better.