I don't know about graphics corruption issues. I don't have any. I'd have to say the jury is out on that one. However, if the mast is twice as tall as the stack, then your error tolerance is doubled: you can have twice the error using the mast and still have the same distance error resulting. It's difficult for me to imagine that you could have twice the error sighting on the masthead. You might get a little more error, but it would still result in a more accurate distance measurement.
It can be difficult to resolve the masthead at extreme range. However, at that range, small errors make huge differences in your result, so range measurements that far out should be viewed as exercises in futility anyway. They just give you a starting number that you know will be very different before you shoot, no matter what aspect of the target you are measuring.
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