Do not use Unique or Trailboss in your 6.5 Creed, unless you are shooting greatly reduced loads with lead or cast lead bullets. Not likely! I'm attaching a burn rate chart. Burn rates are roughly the same across horizontal lines in the chart. You can see that Trailboss and Unique are basically pistol powders, and the H4350 you see extolled by the other shooters above is way down the list (horizontally speaking). Using those fast powders could be dangerous and are certainly way out of the norm for your cartridge. That said, I've had good luck with H414 which is the same powder as Win 760. As you'll see on the chart the burn rate is very similar to H4350. It is a "ball" powder and measures easily on most powder dispensers. Somewhere in that range is the right powder choice. Most of the powder manufacturers have a reloading section for popular calibers, so you should check them out, and also read a good book about reloading theory, practice and especially safety.