Speed will lower them, but you don't want to try to speed up a wadcutter to impact 4" lower @ 15m. Adjust your sights.

Turn your sight down to bottom while counting the number of clicks. Write it down, 158 mag @ 25m = X clicks.

Come up halfway and check the WC's. Adjust up or down as necessary to zero and write it down, 148WC @ 15m = Y clicks. Label the box.

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Carry.."hope" isn't a strategy