Remington's .260 brass is of questionable quality in most batches. You can take Lapua .243 bras, or Norma 7mm-08 (i think they have it) brass, and resize it. Hornady is the only one to make 6.5 Creedmoor to my best knowledge, and theirs would be superior in most respects to Remington's .260 stuff. Also there is the 100fps that the creedmoor * has *........ if you want a 6.5 caliber, with fairly cheap, good, and pre made brass, look at the 6.5x47 Lapua. almost the same as the other two, but laupa brass is available without having to re-size.
P.S. this would probably be a better question to ask in reloading. hope this helped, and welcome to THR.