A lot of the new cartridges do not offer a substantial improvement over existing ones, but many of them do have features or improvements that do make them a better choice.
6.5 Creedmoor is no better than 260 but with the availability of good cheap ammo for the 6.5 CM I would recommend it to a new shooter in a heartbeat, whereas I wouldn't a 260.
There are dozens of 6mm cartridges out there, all offering similar ballistics but all having different strengths and weaknesses.
The great thing is if you don't like the new whiz bang offerings yoy can still by a 308 or 30-30 or 270 as they aren't going anywhere.
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