I recently put this stock on a T3x in 300 WSM. It fits perfectly and once you dremel a notch in the front of the magazine, the WSM rounds feed perfectly. You're down to 5 rounds of WSM versus 10 of 6.5CM or .308 Win, but 5 is still better than the 3 you get otherwise.
Good report Dave, much appreciated. The rifle I just purchased for the wife/kids (see how it works!) is a T3X Stainless/Strata in 6.5 Creedmoor, (the guy at Cabelas actually thought it was Greedmoor), I'd like to come up with a compact stock for them, but a shorter CTR looks like a good option.