I would reduce that down to a 5" circle. Use a ballistics calculator to find your "Maximum Point Blank Range" for your load. Start with that for a few years of hunts. Your cheating yourself out on a lot of "hunting" by wanting to shoot animals from 400 yds. The further you are away from the animal, the more likely you won't get a decent second shot and the more likely they will get away wounded. For an ethical hunter, wounding and losing an animal may haunt you for a long time. Also, you'll be tempted to shoot one that you can't easily get to, so pack a fork, and salt and pepper. I highly recommend you keep your shots to below 250 yds. I certainly can't speak for all but, for me, the joy is in the hunt, not in the kill. I know this is a long range forum, so I'll likely hear some objections.