Been kicking around building a 6.5 creedmoor I have read from 22" to 26" need some advice don't care much for short barreled rifles. I will be using 700 short action it has been worked over ready for a barrel.
26" gave me great velocity and accuracy on mine. But I Love short barrels so I hacked mine off and finished it @ 18.6". It shoots just as accurately. I lost 150-200 fps velocity but this is my general purpose winter hunting rifle and so far it is making good 1 shot kills on caribou. Even at 360 yards. . Farthest I've had a shot so far. .
26" will get you the velocity for long range tho.
I ended up going 260. Rem vs 6.5 creed but barrel length will matter the same. I went with 26" for the added velocity for the longer pokes. I also like the stability of a longer heavier barrel but that's my preference.
I just had a 6.5cm built and I went with a 24" barrel as a compromise since this is a hunting rifle. I'm in the middle of load development so I don't have any velocities yet. For the type hunting I do, the 24" is perfect.