Not on your list (of course), but the first thing that came to my mind was the 7-08. The Grendel might do, but the notion of my pretty little 527 bouncing around in a gritty old truck makes me weep. Maybe the Howa? Not going to find Grendel ammo at the Western Auto either, if that's a consideration.
Not sure about the .223 at 400 as I'm still waiting for my first shot at a deer with mine, but ARs now officially leave me cold, having tried and failed to like them. You may be different. A suppressor would be nice, but apparently it's a looong wait for approval. This may be the only area in which I'm envious of the Brits for whom they're pretty much standard kit.
