How do you set a Leupold magnetic bore sighter for 100 yards without shooting the gun?

If the riflescope has not been zeroed before, simply set the reticle to the center of the grid of the Zero point by adjusting both windage and elevation adjustments. This will set the sight in line with the bore. (Rifle muzzles are carefully machined to be square to the bore as this is important to maintain accuracy.) While adjusting the reticle to match the grid and viewing through the scope, the reticle will move opposite of the adjustment markings. For example, if your reticle is low, you must move your elevation adjustment down for proper alignment of the reticle to the Zero Point grid.

Good luck assuming the scope will start off zeroed!

The laser will point exactly where the bore points. Drop begins immediately as the bullet leaves the barrel.

Start with the laser hitting the target about two inches high, with the crosshairs right on the X ring.

Then "one shot groups" to put hits where you want them.