Not really related, but a few yrs ago I customized a Win Model 70, long action, did a 6.5-06. It had a Rock Creek 8tw, and it was a fast barrel, problem was finding the right powder for a 140 hybrid. Many worked good, none great by my standards, even RL 25 was kind of an ass kicker. The lightbulb came on, try a Norma 130gr golden target, and VV N550, whoa, I wont even say how fast it ran, it was a laser and accurate.
No matter what it accomplished, past 1200 the 140 hybrid stomped the 130gr bullet. in high winds, the 140 gr from 1k -1200 ruled also.
OP, not that you are basing performance past 1200. Seems to me the 6.5 creed was built with the 140gr amax in mind.
Today, I cannot decide if the 6.5-06 or the 6.5SLR was my stupidest decision to build off.