There's apparently a 6mm Creedmore, also - I've seen the ammo sitting on the shelf at a local store for months (so I'm guessing it's less common/popular than the 6.5mm). I've also seen a reference to a .25 Creedmore, which made me laugh; the Creedmore case is nearly identical to the "Ackley Improved" version of the classic .250-3000 Savage, so the quarter-bore variant (at least) of 'the new hotness' has basically been around since FDR was president...
Thanks for the education. I read a bit on it, basically the 6.5 necked down to .243 designed for semis.