Howdy,
On our family ranch we have targets out to 400, so I did a review of a Leupold CDS scope to that distance. If you own a rangefinder, it's incredibly accurate out to 400 yards. Past that, I think you really need to chrono your gun and tweak it exactly to the speed.
I used the ballistics off the Nosler box when I called Leupold. Customer service was top notch. My rifle is a 24" barrel, I am guessing I lost some speed. That's not on Leupold, that's because I don't own a chronograph. Holy smokes man, my eyes can't do much more than 400 yards anyway. It's fun.
Here's the review.
http://https://youtu.be/VDYJFnlpjLE