Objective way to level crosshair

[woods]

There is a tool called the EXD Device

EXD ENGINEERING : EXD ENGINEERING VERTICAL RETICLE INSTRUMENT - World's Largest Supplier of Firearm Accessories, Gun Parts and Gunsmithing Tools

that is well made and mine is dead on as checked by a large level

you put your rifle in a vise and use the EXD to align the bore of the gun with the centerline of the scope. When the EXD shows level then the rifle is uncanted in the vise

aim the rifle out the door or window while in the vise at a distant horizontal or vertical object and rotate the scope until the reticle is level. Carefully lock down the rings while keeping the EXD level and the reticle aligned with the distant object (not as easy as it sounds).

This will make the scope reticle level when the rifle is uncanted. The trick is to duplicate this at the bench or in the field. That's where you need an anti-cant device like the ScopLevel

Scoplevel Anti Cant Leveling Device

which folds down against the scope when not in use

I have used the level-level-level system by Wheeler Engineering

and found it to be inexact and inaccurate. YMMV

 

[BountyHunter]

http://www.longrangehunting.com/forums/f5/reticle-perpendicularity-darrell-holland-29352/

Here is Darrell Hollands article on it.

BH

 

[Old Coach]

The scope has a flat spot on the bottom below the adj. caps.
I use a feeler gage to fill the gap between the base and the flat spot.
You can get a cheap gage at an auto supply store.
I doesn't matter if the rifle or the scope is level using this method.
The scope will be perpindicular to the base.
You will have to use different thicknesses of blades to fill the gap.
It should be a tight fit when the scope is tightened up.
Just pull out the gage and do the "Holland " test.
Most of the time it is right on line.
Try it you will like it.
This works only with a one pc. base or a tactical type base.
Won't work with a 2 pc base.

Coach