I zero in at 100, because my old eyes have trouble seeing the bullseye at 200 through the spotting scope. I DO, however, zero that 100 yard group to be 3" high at 100, so when I move the same target to 200 it is about 1' high and at 300 it then prints on the paper less than 2" low. In my 7 mag this gives me a dead-on hold to almost 400 yards.
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