I'm just jealous that the wonderful 260 Remington never got this kind of love.
It would appear that the 6.5 Creedmoor vs the .260 Remington, is analogous to the .243 vs the 6mm Remington.
Except that the 243 and 244 were introduced concurrently, with the 244 morphing into the 6mm 7 years later, while the 260 and 6.5 Creedmoor were introduced a decade apart, 1997 and 2007. Both Remington, with the 6mm, and Hornady, with the 6.5 Creedmoor, benefited from being able to assess the reasons for the relative lack of success of the 244 and 260 when they improved and then introduced the newer cartridges.
Analogous nevertheless.
Both the .244 and .260 were introduced by Remington. Both the .243 and 6.5 Creedmoor were introduced by other companies
Both the .243 and .260 were introduced wth slower twist rates than the .243 and 6.5 CM.
The .244 lost the popularity contest to the .243 and the .260 is losing the race to the 6.5 CM.
Remington was slow to adopt the .243 and offer it in their rifles. Remington has yet to list a 6.5 CM chambered rifle on their web pages.