In an AR10 it makes perfect sense . I have friends with them and they have not once complained about feeding problems.
In a bolt gun I would not use a 6.5 Creedmore unless I just walked in on a killer deal I could not pass up! The Creedmore does not do anything for me that other cartridges would not do better especially if we are talking hunting! If we add "long range" in front of the word hunting then the Creedmore cartridges do even less for me!
The Creedmore is at it's best when doing what it was specifically designed to do and it was not designed for long range hunting of large game. Obviously it can be used for hunting no problem just depends what you want to kill with it and how far away you plan to shot said critter. I have always that it was silly when people do things like this. No one seems to take the 6mm PPC cartridge hunting in their AR, AK, or SKS, Tikka, Remington 700 etc....The Creedmore line is for High Power and F-Class shooters what the 6mm PPC cartridge is for Bench Rest shooters.
I think it would be fine for Elk sized critter if the shooting is 500m or less. External ballistics don't matter if it is not going to cleanly kill a beast at the range you want to shoot at. I really like my 45-70 for 300m and under but I would not want to try to shoot an Elk at 800m with it. On the other hand W.D.M. Bell killed over 1100 Elephants with a 7mm Mauser with Iron sights at near point blank range.
You should definitely find something with a partion, A-Fram, bonded core etc....All of the really good hunting loads are not VLD with killer BC and the bullets with the best BC are not so hot for hunting larger game at long range. At close range on deer and smaller jacket separation is not that big of a deal.
I put the 6.5 Creedmore in the same category as 243. Great for punching paper, for small stature women and little kids, great for antelope and dear, and for people that have glass shoulders and can not handle a magnum with out getting punished.
Tikkas have a proven track record of accuracy and durability nothing wrong there.
One last thing the 6.5 Creedmore is trendy right now. Just like Germans can not say no to underwear with Alf or David Hasselhoff face on the them a lot of gun owners can not say no to latest craze or trendy cartridge. It hit in 2008 and was lukewarm then by 2011 or 2012 it was the talk of the town! Their has been some issues with factory chambers and factory ammo not matching up well. On top of that Hornady brass has not been holding up well in terms of life cycle.
You might be too young to remember but a few years back when the AR became trendy to own all kinds of wildcats came out to fit and feed from the AR's magazine and work with the limitations of the stock AR15 uppers geometry. For the most part most of those cartridges are worthless to anyone that is not a supporter or that does not need to fit subsonic rounds in an AR platform for use with a can that will still cycle well. In every case if you take away the need to fit it in an AR better cartridges already existed for what ever the mission was.
I would go with a proven winner that has been popular for decades so you know it will not be here today gone tomorrow.