As far as "hurting " cartridge sales of other calibers, the ammo and firearms companies don't give a hoot, because they are still making money no matter WHAT rifle /cartridge a guy buys, as long as he buys !
I have lots of hunting rifles, I also have lots of match rifles, a Creedmoor among them.
Would I buy a Creedmoor for a hunting rifle? Nope, not unless it was in a particular action I liked, because the 6.5 Creedmoor does no more and even less in some cases than the 6.5X54MS, 260Rem, 6.5X55, 6.5/284, or any of the other piles of 6.5's out there.
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