Assuming a properly zeroed rifle and all ranges within 250 yards I wouldn't worry about ranging. With a .308/.30-06 class round and a 200 yard zero the maximum variance from the line of sight is maybe 3". I guess it's fun to "what if" scenarios where you stand off the hordes at long range.
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All that is neccessary for evil to triumph is for good men to do nothing.
Edmund Burke
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