I've shot the 6.5 Creedmore in both a bolt gun and an AR10. It's a good idea but if you don't reload you should pass on it. The Hornady brass isn't that good.

In the 6.5 class of cartridges I would vote for the 6.5 SAUM. I've got 600-700 rounds through mine and it's a tack driving hammer. At this point I'm shooting necked down and turned 300 SAUM brass from Norma, my pet load is driving the 142gr SMK at 3210fps to great success. This cartridge shoots flat and has decent barrel life, so far. I've shot it out to just under 1500yds.