Here’s How to Sight In a Rifle With A Scope

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Here’s How to Sight In a Rifle With A Scope

Interested in finding out how to sight in a rifle with a scope? Keep reading for some step by step instructions.

Regardless of whether you’re hunting black bear, deer, cape buffalo, or some other big game animal, it is very important that you properly prepare your equipment for the hunt. One of the most important things you’ll need to do is ensure that your rifle is sighted in correctly so you can hit what you’re aiming at. Today, I hope to provide some assistance in this matter by explaining how to sight in a rifle. Specifically, since most hunters use telescopic sights on their rifles, this article describes how to sight in a rifle with a scope.

After mounting a new scope on a rifle, it is very important to ensure that the reticle is completely level. Even a slight cant to the reticle can throw off the impact of the bullet and make the scope much more difficult to sight in. Also, properly secure the scope in the rings and ensure that the scope rings are tightly mounted to the base. There should be no wiggle whatsoever to the scope.

How to Sight In A Rifle: Boresighting

When you mount a new scope on a rifle, it’s best to bore sight it before actually shooting the rifle. First, ensure that the rifle is unloaded and that the barrel is unobstructed. Then, remove the bolt of the rifle and mount the rifle in a secure rest pointing downrange. Standing behind the rifle, look through the bore carefully move the rifle until your target is centered in the bore.

how to sight in a rifle boresight

Then, without moving the rifle, adjust the scope so that the reticle is centered on the same target. The turret on the top of the scope adjusts the elevation (up and down) of the reticle while the turret on the side adjusts the windage (left and right). It is not vitally important for the bore sight to be extremely precise. It just needs to be close enough so that the rifle will hit somewhere on paper at 25 yards in the next step.

how to sight in a rifle boresight 2

Your view when looking down the bore of the rifle should look something like this.

You can also use a laser boresight that fits in the chamber of the rifle to accomplish the same task. The end goal is still the same though: ensure the scope reticle is centered exactly where the rifle is pointing, the laser just makes it a little easier to be precise than merely looking down the bore of the rifle.

How to Sight In A Rifle: Getting On The Paper

After bore sighting the rifle, you’re ready to start shooting. I like to shoot at 25 yards first, then fine tune my zero at longer ranges. I’ve learned that this saves time, ammunition, and frustration in the long run by avoiding taking shots at 50 or 100 yards that don’t even hit the target. The exact target doesn’t really matter at 25 yards as long as it has a distinct aiming point. Some people use bulls-eye targets with lots of success. I prefer to use a dedicated zero target with an easy to use grid format that helps easily determine my adjustments.

When sighting in your rifle, it is very important to shoot from a stable position with lots of support. Use sandbags or a specially built rifle rest to do this. Whenever possible, avoid supporting the rifle with your muscles, as this is less precise than using a stable object like a sandbag. Finally, focus your scope on the target that you are shooting at. This will give you a crystal clear view of the target and make the shooting easier. Most scopes have a dial to focus the lens, which is normally located at the end closest to the shooter. You can see it on my rifle in the first photo. It’s the dial located on the end of the scope, just to the left of the word “Conquest.”

Once you’re set in a steady position, fire three shots at the center of your target at 25 yards. Especially if you’re using a high magnification scope, you may be able to see the holes your bullets make in the target. No matter where you see the bullet holes in the paper, do not change your point of aim. Keep aiming at the bulls-eye, or you’ll end up chasing your shots all over the target. It’s ok if you don’t hit the bulls-eye at first. In fact, it’s almost guaranteed that you won’t.

After you fire your first group, check the target to see where you’re hitting. Measure from the center of your group to the bulls-eye and adjust your scope accordingly. Most rifle scopes have 1/4 MOA adjustments. This means that 1 click will move the bullet impact 1/4″ at 100 yards. However, this means that you need to make 4x times number of clicks (16 clicks=1″) to move the bullet impact the same distance at 25 yards. For example, the point of impact on the target below needs to be moved 1/2″ left and 1/2″ up. At 25 yards, that would be 8 clicks each way.

how to sight in a rifle target 1

At 25 yards, adjust the scope 8 clicks left & 8 clicks up

As stated above, the turret on top moves the bullet impact up and down, while the turret on the side moves it left and right. As you can see in the photo below, most scopes have the measurement increments annotated on the turret, along with the proper direction to turn it. In the case of the scope on my rifle, turning the turret clockwise will move the impact of the bullet up or right, depending on which turret you are to sight in a rifle scope adjustment

For example, assume that I shot a group at 25 yards that hit 1″ low and 4″ to the right with my rifle in the photo above. Since I need to move the bullet impact up and to the left, I’d turn the top turret 16 clicks clockwise and turn the side turret 64 clicks counterclockwise.

A trick I learned in the Army is to go several clicks past the required number, then go back. For instance, I’d go 21 clicks clockwise, then 5 clicks counterclockwise on the top turret. After that, gently tap the turret several times to ensure the adjustments are locked in. This is even more important when making very large adjustments, or when using low quality scopes.

After making the required number of adjustments, shoot another group at the bulls-eye. If that group hits where you’re aiming, you’re ready to move the target out to 100 yards. If not, make the necessary adjustments to the scope and shoot until the rifle is dialed in at 25 yards.

How to Sight In A Rifle: Fine Tuning

Using the same techniques described earlier, shoot a group at 100 yards. Since you zeroed the rifle at 25 yards, it should be at least hitting the paper at 100 yards. Measure the distance from the center of your group to the bulls-eye and adjust the scope as necessary. Remember: 4 clicks=1″ at 100 yards, not 16, like at 25 yards!

When zeroing at 100 yards, your windage should be dead on. However, there is some debate as to where your shots should be hitting elevation wise. If you’ll be hunting at a relatively short range, then it might make sense to adjust your scope so that the bullets are hitting the bulls-eye at 100 yards.

However, sighting in your rifle so it hits slightly high has advantages as well. Each rifle is different and an ideal 100 yard zero varies. Using my rifle in the photos (a Ruger M77 Hawkeye in 9.3x62mm Mauser) as an example, I sight it in so my shots hit about 2″ high at 100 yards. With this set up, the bullet will hit ~1″ high at 50 yards, ~1″ high at 150 yards, dead on at 165 yards, and ~3″ low at 200 yards. This means that without having to adjust my scope or my point of aim, I can take a shot on a deer out to 200 yards and still hit the vitals.

how to sight in a rifle target 2

Adjust the scope 2 clicks left to have an ideal 100 yard zero

After you’ve made your final adjustment, fire one last group to confirm it. If the group hits where you want it to, you’re done. A good scope will hold your adjustments for a long time, certainly through hunting season, as long as you don’t drop the rifle or otherwise damage your scope.

I hope you found my description of how to sight in a rifle with a scope useful and interesting. Are there any other tips or tricks out there that I might have forgot to mention?

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  1. jOHN August 6, 2014 at 8:30 pm - Reply

    Can you suggest a good bullet for a Springfield 1989 45-70 Trapdoor. I am going out west to hunt a buffalo and want to use this old gun.

    • John August 7, 2014 at 2:34 pm - Reply

      Whatever you do, don’t use anything labeled “magnum” or “P+”. The 405gr soft points made by Remington are a good choice. Ammunition labeled “For Use In All Rifles” is what you want (the 405gr Remington load fits the bill here). They are loaded to a low enough pressure that they will work safely in your Trapdoor Springfield, yet will still perform well on bison. Many hunters in the 1800s shot bison with similar loads with great success. Don’t try to break the shoulder though, aim in the armpit, or high in the lungs. Good luck on your hunt!

  2. Rick October 8, 2015 at 11:16 pm - Reply

    Fantastic post John. You are right on the money about many guys getting all pumped up for hunting season with trail cams, camo, maybe even a new ATV, but completely neglect to sight their rifle in. Often everyone looks the part, but can’t perform due to poor planning. Thanks for this, Ill be sure to pass a link on on my site.

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