The problem with zeroing at longer ranges is it introduces more variables. Wind comes into it more for one. As do temperatures and drift and all kinds of other things.
The reason pretty much everyone zeros at 50-100m is to take as many variables out of it as possible.
I've tried zero'ing further and it does your fucking head in. You're forever adjusting to try and correct a problem that doesn't exist in the first place in my opinion.
I set mine up at 100m, but I set it up to fire 1.5" high at 100m, which is a zero of 200 yards according to my ballistics app. It also makes the holdovers on my reticle line up at 300 yards, 400 yards, 450 yards and 500 yards (at 15x zoom). And my rangefinder is in yards of course.
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