1. I don't think shooting quickly at 400 yards is a great idea, unless you want a good chance of a miss or a wounded animal.
2. Even if I would somehow not have one or two seconds to twist the dial, my rifle, sighted 1" high at 100 yds, is 16" low at 400 yds. That's precisely 4 MOA, which is 2 mil dots on my scope when at highest magnification.
