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First of all, are the sight @ "zero" on the rifle?
For this sighting - in use good ammo not just any surplus ammo available.
Meaning is the front centered on its dovetail? is the rear the same.
This is called mechanical zero, now shoot at 100 yds and determine the impact, move the front towards the group moving it by the multiple of the distance from aiming times 0.008".
0.008" is the distance that will induce a 1" change @ 100 yds. the same for the elvaation (more later).
With the windage @ "zero", now the elevation, @100yds, turn the rear elevation down to bottom and bring it up, counting eight (8) clicks.
Determine the offset correction and either FILE the blade top down to RAISE the impact or replace with a new unused front sight to LOWER the impact.
When everything is a zero, you're done.
As a new M1 owner, try and buy the Kuhnhausen book "The U.S. .30 caliber Gas Operated Service Rifles. It has valuable information on maintaining your Garand.
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