I certainly agree that accuracy at reasonable (effective) velocity ought to be the goal. However, what works in one .416 Rem. Mag. may not work in another. My own Remington 700, which I used on Cape Buffalo, Hippo, and Australian Water Buffalo, gave its best accuracy using 400 gr. Hornady softs and solids @ 2267 fps avg.
However, a couple years later, when I was able to get a Custom shop Winchester Mdl. 70 stainless synthetic, that gun would absolutely not shoot satisfactorily until I hit 2400 fps. Then the groups shrunk to half the size of the 2250-2300 fps loads groups.
Whatever it takes....
In a moment of foolishness, I sold the 700 several years ago, but still have the Mdl. 70. I always zeroed both guns about 2" high at 100, resulting in being a couple inches low at 200 or 220. In actual practice, the furthest I've ever shot a game animal with either gun was about 80 yds. on a Hippo. All the buff and a couple of Brown Bears were all shot at between 50-60 yds.