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Sight in at 2 to 2 1/2 inches high at a 100 and you can hold dead on to 250 or further. A hit anywhere from three inches above to three inches below point of aim is still a dead deer. I don't quite agree with 4 inches high at a 100 if it is to be used for deer as at the top of the trajectory it will be 5 to 6 inches high which could result in an miss or worse yet a bad hit. You have to adjust your hold, which defeates the concept of being able to hold dead on. BDC scopes usually do need to be zeroed at 100. They work great for long shots at known distances, however if you have to get off a quick shot at 225 unmeasured yards, or is it 275 yards, then you start having to guess holdover at what should be a dead on hold for a rifle sighted in a couple of inches high to begin with. If they call for initially zeroing in at 200 yards, then you should be fine. My 7mm mag can be shot dead on for deer to 296 yards which is as far as I am comfortable shooting from a field position.
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