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I don't get the Grendel thing. I've been into the 6.8 for a while. Do some real research on the two cartridges and you'll get your answer.
6.8 is readily available on the shelf at sportsmans warehouse. 6.5 Grendel I have never seen factory ammo for.
6.5 has the better ballistics.
My thoughts are the 25-45 sharps looks like a good contender for the AR platform, if your stepping out of the 223 caliber.
I'm hoping it will be widely accepted as well as ballistically sound. Only a bit is available that I've seen.