What a Cant!

This rifle belonged to David Tubbs. He has to do 2 things:

• Make sure his reticle is level with the ground.
• If the center of the reticle is now 1" to the right of the bore center, aim 1" to the lefton the target. One inch on the target isn't a big deal. In a competition at a fixed range you get sighters, so the offset is no problem, and you can adjust windage instead.

If your crosshairs are centered above the bore, and  your reticle is level with the ground, you don't have anything to worry about.

This post is dedicated to Peter Cooke and Dudley Moore.

Scope shimming calculation

If you run out of scope adjustment at long range you may end up putting a thin metal shim between one of the lower rings and the scope. How thick a shim?
Moa is about 1" at 95.5 yards, 1" at 3438 inches, so 1 Moa = 1/3438" for rings an inch apart, 2/3438" for 2 inches apart.

So rings 3.438" apart, 10 Moa shim, 10Moa * 3.438"/3438 = 0.01" shim at one end.

The rule of thumb on the Internet is:
"Assuming you have about 3 1/2" between the rings, placing a .001 shim under the rear will raise your impact point by 1 MOA."

Which is pretty close.

Free Android Ballistics App

Here is the free android app, from Android Market. 
Android Ballistics