Put the rear sight on the '1' mark, make sure that the top of the front post is level with the top of the rear sight. Shoot 3 shots at a time at 25m. This will give you a 'battle zero'...all shots will be with in a 16" circle from 25m to 1000m....if you do your part. Then fine tune it for further accuracy. No need to re zero at any other ranges, just raise the rear sight to the appropriate meter number. All the way back on the sight is the same as 250m.
Set the front post half way up and from left to right....this will get ya started. Purchase the front sight drift too. Up in the post make the bullet go down, down make the bullet go up. Left makes the bullet go right and right makes the bullet go left...really easy..should take about 9-12 shots. i guess Lancaster doesn't sight in the weapon after building..bummer.