I'm a handloader.. I'm in the 260 camp.... I have little brass that is 260 Rem headstamped, but plenty that is 7/08 or 308 head stamped....
I have a Rem VLS in 260...
a Pair of Ruger Stainless 77 Mk2s... 1 in 8 factory twist...
first thing I did with each one, is seat a dummy round with a 142 grain HP Sierra, magazine length and
took each to the gunsmith and had the chamber reamed out to fit it.
Also have a couple of 6.5 x 55s and a 6.5 x 57, chambered on a long action Model 70, with a heavy magnum
contour barrel.. a 28 inch Pac Nor, with a one in 8 twist on that one...
The Creedmoor does exactly what my other 6.5s do....with no real world increase in performance in my world...
people may consider it obsolete, but those of us who shoot 260s don't think so...
but hey, I don't want to rain on anyone's Creedmoor Parade....
and I don't think I've ever bought a box of 260 ammo....
