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With most modern chamberings there isn't enough drop out to 300 yards to be of any concern. You can zero at 100 yards and get hits out to 300 without any hold over. If the range is between 200 and 300 I just aim at the top of the back. Some guys like to zero at 200 which takes some guesswork out at longer ranges. It makes things more complicated at close range however. Most guys shooting scopes with dots recommend a 100 yard zero and use the dots for longer shots.
The BDC scopes or long range dots can be a huge help at longer ranges, if you have a range finder to know the exact range. And if you know how to use the scopes.
A lot of these scopes are too "busy" to suit me. Just too much to look at. I like the Burris version and similar styles better. Just simple dots on the vertical crosshair. I've found it to help. I wouldn't trust any of them until I had actually shot at those ranges though.
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