I've been playing with the 308 150 grain Partition launched at about 2700 fps. Don't know how the construction will compare to the 6.5 and I know the devil is in the detail when it comes to bullet construction but...
So far I've not found the Partition to be as accurate as the 150 grain Hornady Spire Point that I also have loads for, though to be honest I didn't put much work into load development and suspect that I could do a lot better if I put my mind to it. I suspect that Partition has got a so-so reputation for accuracy based upon the older manufacturing method which was less consistent than more modern methods. I think a bit more work could tighten things up for me.
Performance on game, however, has been sufficiently impressive to convert me to using the Partition as my main deer load. I shoot mostly sika, in forestry, at last light and so anything that puts them down faster is a "good thing." The Partitions are the only thing I've shot at the sika that, in about 50% of cases, puts them straight down where they stand. That means 50% less follow ups into thick forestry in the pitch dark after a deer that will almost certainly have run 100 yards and will have died under a bush, behind a tree and at the bottom of a ditch.
Sika aren't big deer so I don't need penetration in a big way and I'm not seeing huge meat damage with the Partitions plus they are leaving the rifle 300fps slower than the Spire Point load, just for information.
I'm sure you've probably tried the Partitions in other cartridges but my view is they are worthwhile at least trying. Worst comes to the worst you can always sell the bullets for more than you paid for them