I use a Lead Sled to get me to zero.
From there I go to a sand bags to really finish with 3 shot groups.
i found that when initial sighting in it saves me time and ammo.
i take my shot with the use of the sled. i then zero my crosshsirs on my target hit point or point of impact. Then rezero the scope to the Bull center as i look thru the scope adjusting for windage and elevation.
Works for me.

JW