So how does the Creedmoor differ in bullet choice over the .260? It's the same bullet.
That needs to be asked in it's own thread to do it justice. Basickly the problem with the .260Rem is that they did not forsee the jump in ELD/VLD long heavy projectiles that kids like me in the 1980's had been begging for for decades. So many short action rifles cannot load from the magazine with the newer longer heavier ELD/VLD bullets even if you had a chamber cut for them. For about a decade you could not get on a gun forum without it being full of people that bought Remington Model 7's for their Ultra Light Mountain rifle build that suddenly figured out they could not shoot the cartridge and bullet combo they wanted to shoot. Even in the 700 line with short actions this was such a problem we now have the Wyatt box.
The 260Rem was just brought to market too soon, did not have the marketing push behind it that the 6.5CM had and it was designed before the modern ELD/VLD bullets exhisted. It was designed and marketed as a hunting cartridge not a target cartridge.
There is a guy that did A-B comparison with his Accuracy International not sure if it was AW or AE or which. It is one of the best articles I have seen since it was true A-B with same rifle just different barrels.
I have campaigned a 260Rem in F-Open and now have a rifle in 6.5CM to do the same. Most people on this sight have not put 5000 rounds or more through a rifle in 260Rem.
The bigest thing that the 6.5CM has going for it over the 260Rem is factory loaded ammo. It is slim picking for the 260Rem today if you have to buy what Walmart stocks! The 6.5CM makes far more sense today than the 260Rem but that is a combonation of people making poor purchase decisions and Remington not looking ahead.
You will also see a lot of people give the Remington Model 7 a lot of hate but really the real problem was their own ignorance. It is always easy to blame an object or someone else for your delima.
The 243 and 25-06 has suffered a like fate because rifle makers are idiots and think much like 1980's Detroit Auto industry. They kept kicking out the same slow twist rate barrels. No one wanted to pay to update and recertify them with SAAMI with faster twist rates "I assume" and bullet makers were not going to make bullets that factory rifles could not shoot! If you want a compettive 243Win you have to custom build one to get twist rates suitable for the best bullets on the other hand you can hit the easy button and buy a cheap offf the rack 6CM that will shoot the best 6mm bullets of today. So of course everyone will bad mouth the 243Win and praise the 6CM! I was shooting 115-117gr. Detacs what 20-30 years ago after David Tubb won nationals in Silhouttee with a 243Win shooting DTAC's. Amazing what we could do before Hornady came to our rescue with Propritary cartridges that do not do anything we could not do before in 6.5mm and 6mm. Shooters in High Power NRA Across the Course where shooting 6.5x55 for a long long time then they all died or switched over to Tubb Guns in propritary cartridges. Slight exageration on my part. As long as you do not need to fit a cartridge in a short action you would be amazed what can be done with the 6.5x55 with modern bullets, powders and ignoring SAAMI.
For a long time long range shooters suffered from a lot of snooty oh that is a hunting cartridge not a target cartridge sort of attitude. Just look at what you see with 6CM, 6 Dasher, 6XC, 6BR, 6GT, 243Win and on and on just listen to what people type and how they talk about these different cartridges. Facts and results do not matter nearly as much to most people as their bias and the bias of their peer's! You can hear the condesending tone dripping from their words. Some of them make really good points depending on their use but some of them just have so much bias nothing else will do.
If you want to see a group of followers with guru's, magical talismans, that need lots of group approval and validation get onto a sight like SnipersHide! Lot's of vertical intergration with sponsors, gunsmiths, and the like in a true echo chamber.
Here is a good article on the 260Rem
http://demigodllc.com/articles/6.5-shootout-260-6.5x47-6.5-creedmoor/?p=1