If the first shot was far off the mark, fire another after adjusting, then move the box to 100 yards. With modern hunting loads, a center hit at 35 yards means a near-center hit at 100. To extend point-blank range, you want a 200-yard zero. After the first shot at 100 yards, adjust so the next shot hits 2½ inches high. Here you need four clicks to shift impact an inch. Move the box to 200 yards, fire, and adjust to center. Confirm with a three-shot group. You're finished. Given careful bore-sighting, you'll have used as few as seven cartridges, total—plus a rock and a box.