Re: 6.5 creedmoor reamer question
I'm no expert, but my guess would be no. The 6.5 CM case is longer than the Lapua, so I would guess that you would be able to do it w/o cutting it back, and threading.
Vise versa going from Creedmore to Lapua it would need to be cut back, threaded, and chambered.
That's just my guess. Someone here may be able to give you a better answer.