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  • Writer's pictureJason Stanley

Do's and Don'ts of Zeroing a Scope

Updated: Mar 20


A key to success is never losing sight of the fundamentals. One fundamental responsibility of a hunter is to check the sights on their rifle. Here are eight fundamental Do’s and Don’ts of checking the zero.


Don’t: Assume the sights have not moved since last year.


Do: Check the zero

This October I checked the zero on seven different rifles. I had to adjust three of the scopes. Two of them were only off a couple clicks. One however, was off by more than two inches. I have no idea why the zero moved, but I am glad I checked.

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Don't: Wait until the Last Minute





Do: Check the Zero roughly One Month Before Season

Things go wrong, even when the rifle is just sitting in a safe. Maybe solvent got into the trigger and gummed it up. Maybe the springs gave out in the turrets. Maybe last year's shot broke the firing pin. Maybe.......

In a perfect world, we would be practicing once a month at varying distances. In reality, it would be great if the zero is checked roughly one month before season. That will allow enough time to fix any problems that may have occurred. If needed, do a confidence shot one week before the opener.

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Don't: Assume your scope stays sighted in for the whole season





Do: Recheck if needed anytime during season


Scopes get bumped. Rifles bounce around in the vehicle or fall over when crossing a fence. Things happen. Do not assume that the scope will stay sighted in over the course of a long season, like many predator seasons. If you ever suspect the sights are off, don't be afraid to check. At the very least, this scope check will serve as a confidence shot.

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Don’t: Make multiple adjustments and not confirm



Do: Confirm your clicks with a final shot



Not all scopes have adjustments (clicks) that can be trusted. This is especially true when the turrets are not routinely moved (as is the case with most hunting rifles). For the majority of the hunters, we should always confirm a scope adjustment on target.

Yes, many long range hunters and PRS competitors commonly “click” to their targets then fire a “bullseye”. However, they have two advantages that many hunters do not. First; those long range shooters practice hundreds (possibly thousands) of rounds at varying distances every year. Each time, checking to make sure their notes match the clicks. Second; through that practice, the scope clicks have earned the marksman's trust.

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Protect your Scope and Action with Scope Shield's Action Express


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Don’t: Use a dirty barrel




Do: Ensure that the barrel is in the precision window

If the rifle did not get cleaned after last year’s hunt, clean it. If the barrel is clean, take (at least) one fouling shot before checking the zero.

A clean bore shot (fouling shot) should be relatively close to the aiming point, but it probably will not be the same as the following shots. A safe 100 yd. rule of thumb is; if the first clean bore shot is more than two inches away from the aiming point, adjust the sights. Confirm the adjustments with a second shot.

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Don’t: Use different ammo

Do: Use the same ammo that you will be hunting with

It is fine to shoot “left-over”, “extra”, or “other” rounds when fouling a clean barrel into the precision window or for the first few shots when mounting a new scope. However, once the time comes to check the zero, make sure to use the same ammo that will be used while hunting.

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Don’t: Use an unstable rest





Do: Have a stable platform

This is not tuning and it is not practice. There is one purpose when checking the zero of the scope; To make sure the rifle prints where it is pointing. Eliminate all other variables from the equation.

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Don’t: Have a general aiming point







Do: Have a small aiming dot




Most animals we hunt have a four inch (or bigger) kill zone. That does not mean we should draw a four inch circle and call it good. The four inch circle is fine, but there should be a smaller aiming dot in the middle of that four inch circle. When you zero your scope using a small (1/2" or smaller) dot, it makes hitting the four inch circle seem a little easier. “Aim small, miss small.”

To print a copy of my sight in target: https://www.ctdshooting.com/post/reproducibles

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As hunters, we often prepare all year for a split second shot opportunity. Do not let all that time, money, and effort be wasted because these fundamentals of zeroing were not followed. Good luck to everyone during their hunting season. Until next time, enjoy the process.


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