Yes that is what I'm telling you! I don't think you would want to stand at 400 yds and let me shoot at you with any double I own, thinking I couldn't hit you!

Though I don't generally shoot whitetail at any range, I see no reason to shoot them at that distance, when a little hunting will get "YE AS CLOSE AS YE CAN LADDY, THEN GET TEN YARDS CLOSER" QT: JOHN "PONDORO" TAYLOR!

As others here have told you, the flight of the bullets from a well regulated double shooting a proper load, shoot paralell all the way down range, and certainly you wouldn't be shooting at 400 yds with a 577NE with iron sights at a whitetail,but you wouldn't do that with a single barrel rifle chambered the same way either. With a scoped 7X65MMR, however, it would be as easy as anything you would be able to shoot whitetail with haveing a single barrel. I will give you an example, of shooting with a Chapuis double rifle , chambered for 9.3X74R with a scope, fired from a kneeling position hitting a coyote at 271 yds measured, not with one barrel, but with a shot from each barrel! That shot was witnessed by not only me, but by 400 Nitro express, as well. and it was not a fluke, he does it all the time. That same rifle took a kudu at somewhere around 300 yds, and other game in the 200 to 300 yds range on that same safari. He posts here regularly, and is known as 450 No2 Nitro, given name TONY!