Cheers for all the input everyone, lots to think about.
Just for anyone else who looks at this thread in the future, I have found a video by Bergara with an 18" 6.5 Creedmoor vs a 24" using 130TMK (doesn't say what the load is). The 24" got 861 m/s (2824fps) the 18" got 808 m/s (2650fps) which I would think is not bad for a 18" Creedmoor especially if it's intended use is 500 yards and under with low recoil. The 18" shown in the video is the Extreme Sporter, it has essentially the same barrel and action as the Extreme Hunter.
https://www.youtube.com/watch?v=chH2dtr23MM
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