Charlie,

In the 6.5 creed you'll want at least a 24" barrel if you want to carry the 140s to 1000 yards....effectively anyway.... I was kicking this same thing around for the last year or so... I'm building mine in 260 REM.... For the 6.5 Creed I think you want a least 24".

According to my calculations (Strelok Pro) with a 143 grain ELD-X with muzzle velocity of 2722 it takes almost 29 MOA of elevation @ 1000 yards. (25" barrel) 1-8 twist. I doubt you'll be able to get that velocity out of a 22" barrel.

The other thing to consider is your scope and how much elevation adjustment you'll have. With my setup I'm running the Sightron 6-24x50 FFP MOA-2 reticle that has 80 MOA of total adjustment. I had to put a 20 MOA rail on it to insure I could get to 1000 yards.

you can get there with a 22" I think... with a muzzle velocity of 2647 (3 inches less barrel @ 25 fps) I have it showing (1430 fps with 649 ft lbs of energy @ 1000) 30.75 MOA up.