Was pondering the same for a while. Then realized that a Creedmoor or 7mm08 is not much heavier if done right and offers waaayyy better versatility. But still a cool concept, and eludes only come with howa minis, thus you have to go for one of those, if you want to go that way...
As for the choice between 6ARC and Grendel My suggestion would be to get GRT and see what velocities you can get out of the two, with the bullets you would likely want to shoot, and what the energy would be at those ranges you want to reach out to.
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