The Grendel was designed specifically to work in the AR15, it has just made it's way into micro action hunting rifles, it was never designed to replace the 6.5x55 or similar cartridges.
The Creedmoor was basically meant to compete with the 6.5x55 and 260 but fit comfortably into a short action.
In a way it was a marketing exercise, but right from day dot the cartridge was deigned for target shooting and was available in suitable target rifles, with a sensible barrel twist and good factory ammo available for target shooters from day one. Something the 260 and Remington never did.
The PRCs are similar to the Creedmoor in that they were offering what many other cartridges did (mostly wildcats) but good factory rifles and ammo was available from the out set.
They may not have been filling voids as far as ballistics goes, but you'd be hard pressed to find factory rifles and factory ammo at the same price that offers the same performance as these.
I shoot a 260 and think it's great, there's no need for me to sell it and buy a Creedmoor but that doesn't mean there are no benefits to the CM over the 260.
First and foremost being factory ammo, don't think I've ever seen a box of 260 ammo for sale.
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