Both because the Creedmoor is better designed for the reality of short-action magazines and long bullets, AND because Hornady and Ruger started out with the correct rifling twist for longer bullets, and produced very accurate (yet affordable) ammo and rifles. They did everything right that Remington missed with the .260, and followed up, instead of giving up on the .260 like Remington did relatively quickly after its introduction in 1997. Some of the factors that have mostly killed the .260 couldn't have been foreseen by Remington, but some could have, and it certainly could have used better (and longer) factory support.
Don't get me wrong. I've owned three .260's and have one right now, a special-run Tikka T3 from Whittaker Guns with a 1-8 twist. It's one of my favorite "modern" rifles, but my Ruger American 6.5 Creedmoor not only bypasses the cartridge-length problem but shoots even better!
