I agree that 284 is a step up in performance from the 260, but it appears that squishing it in a short action limits it a reasonable bit.
Whereas the 284 needs bullets seating deep in the case in a short action the 260/creedmoor has ample room to load them out meaning you can run 140gr bullets at much the same velocities as the 284 running 162gr bullets.
The 284 will of course have more energy on target, but the 140gr 6.5mm and 162gr 7mm bullets have very similar BC and produce much the same ballistics.
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