I am building a 6.5PRC or 6.5SAUM (have not decided 100% yet) on my Titanium 700 long action. I plan on seating them waaaay out there to maximize the long action. After studying both it is obvious they kick ass in either length action, but I would feel like I am wasting some of the capacity on a short action. But it appears they will still be blazing fast regardless... I wouldn't worry about it!