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These guys explain it ...
An Official Journal Of The NRA | 6.5 Creedmoor: Why Is It So Popular?
While some consider the 6.5 Creedmoor a new cartridge, ballistically speaking, it’s actually on par with a much older offering. But that doesn't stop it from taking over the precision-shooting world.www.shootingillustrated.com
Another stupid comparison with no data, you're smarter than that. Let's see an exact comparison of loads with the "longer" bullets in the 6.5 and 260, utilizing the same exact bullets and powder, there will be no difference except for the seating depths in the respective cases.
Look in the Hodgdon manual, almost exactly the same powder/powder weights for 143, 147, 150, and 153 grain bullets, all almost exactly the same velocities with the SAME overall cartridge length (2.8 inches).
One of the heaviest, highest BC bullets I could find in loaded ammo for both cartridges (I wanted to find an EXACT comparison with a heavy for caliber bullet), the 6.5 beats the 260 by a whole 45 fps
260 Remington 156gr Berger EOL Elite Hunter – Copper Creek Cartridge Co.
coppercreekcartridgeco.com
6.5 Creedmoor 156gr Berger EOL Elite Hunter – Copper Creek Cartridge Co.
coppercreekcartridgeco.com
Let's take a look at Hornady Superformance ammo (again, an EXACT comparison), 260 @ 2930 fps, 6.5 @ 2950, truly revolutionary at 20 fps faster, eh? And I have a feeling that the 6.5 is loaded to a slightly higher pressure and that if the 260 was loaded to the same pressure it would beat it.
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