Originally Posted by Orin
One more: Start rezeroing at a range you can see easily. 20-25 yds is fine. Once you get it close you can move targets out to your preferred range & finish the job. No need to waste ammo at first by trying for groups. One bullet will tell you what you need.
..indeed, the closer the better to save ammo.
Another thought is one shot zero. At a close range, get your rifle in a fixed device such as a gun vice or lead-sled and sucure your rifle as much as possible so it wont move.
Fire one shot and adjust your crosshairs to the hit, then you'll be right real close to zero with some fine "tunning".