How to Sight In a Rifle Scope (Step by Step)

To sight in a rifle scope, bore sight first if you can, fire a three-shot group at 25 yards to get on paper, adjust from the group center, then move to 100 yards and repeat. Confirm with five shots. Write down the rifle, ammo, zero distance, and final turret setting.

I am Aaron Rice, General Manager at Ozark Armament. I run the day-to-day fitment, setup, and warranty bench across our optics line, and I have zeroed scopes on customer builds, test rifles, and my own range rifles for years. If you are shopping before you zero, start with our AR-15 scopes and optics collection so the optic, mount, and use case line up before you burn ammo.

What Sighting In a Rifle Scope Means

Sighting in a rifle scope means adjusting the scope so your point of aim and point of impact meet at a chosen distance. Point of aim is where the crosshair sits. Point of impact is where the bullet hits.

That sounds simple because it is. The trick is removing bad data.

A good zero is tied to one rifle, one optic, one mount, one ammo load, and one distance. Change any of those and you should confirm again. You may still be close, but "close" is not the same thing as zeroed.

For most AR-15 LPVOs, fixed magnified optics, and general-purpose hunting scopes, a 100-yard zero is the cleanest baseline. You can use 25 yards to get on paper, but do not stop there unless 25 yards is your actual intended zero.

What You Need Before You Fire

Bring the boring stuff. Boring is what saves ammunition.

• Your rifle with the scope mounted and the mount checked
• The exact ammo you plan to use
• A stable rest, sandbags, bipod, or front and rear bags
• Paper targets with a small aiming point or grid
• A ruler, target grid, or reticle for measuring
• The tool for your turret caps
• A notebook or phone note for the final zero
• Eye and ear protection

The target matters. A plain bullseye works, but a grid makes corrections faster. NSSF offers free printable targets as PDF files for standard 8.5 x 11 paper.

Before live fire, check the mount. Ring screws and base screws need to be snugged to the mount maker’s published torque. On an LPVO mount, seat the rail clamp fully in the Picatinny slot and push it forward before tightening.

How to Sight In a Rifle Scope

This is the workflow I use for a normal 100-yard zero. It works for a bolt gun, an AR-15 with an LPVO, or a fixed magnified optic. The numbers change if your final zero is different, but the order stays the same.

Step 1: Bore sight first

Bore sighting means aligning the scope roughly with the bore before live fire. It is not a zero. It is a way to keep your first shots on paper.

With a bolt-action rifle, remove the bolt, set the rifle in a stable rest, and look through the bore at a target. Without moving the rifle, adjust the scope until the crosshair sits on the same target. With an AR-15, use a laser bore sight.

Do this at 25 yards if you can. A 25-yard target gives you enough room to see error without wasting half a box of ammo trying to find paper at 100.

Step 2: Fire a three-shot group at 25 yards

Set a fresh target at 25 yards. Aim at the exact same spot for all three shots. Do not adjust after the first round unless the bullet missed the entire target.

Find the center of the three-shot group. That center is your point of impact. Ignore the urge to adjust off the worst hole. If you called a bad trigger pull, note it, but do not build the whole zero around one hole.

Step 3: Measure from group center to aim point

Measure how far the group center sits from your aim point, both vertically and horizontally. If the group center is 2 inches low and 1 inch right at 25 yards, your correction is up 2 inches and left 1 inch.

Most turret arrows show the direction the bullet impact moves. If the turret says "UP," turning that way moves the next impact up. If the side turret says "R," turning that way moves the next impact right.

Step 4: Make a rough 25-yard correction

At 25 yards, one minute of angle is about 1/4 inch. Minute of angle, or MOA, is an angular measurement. NSSF explains that 1 MOA is 1/60th of a degree and equals 1.047 inches at 100 yards. At the bench, use the simple version: 1 MOA is about 1 inch at 100 yards, 1/2 inch at 50 yards, and 1/4 inch at 25 yards.

If your scope adjusts in 1/4 MOA clicks, one click moves impact about 1/16 inch at 25 yards. If it adjusts in 1/2 MOA clicks, one click moves impact about 1/8 inch at 25 yards. Our Razorback 1-6x24SFP Rifle Scope uses 1/2 MOA clicks, push-lock turrets, a 1-6x range, a 24 mm objective, and a Mil Dot illuminated red/green reticle.

At this stage, get close. You do not need a perfect 25-yard zero before moving to 100.

Step 5: Move to 100 yards and shoot another group

Once the 25-yard group is close, move the target to 100 yards. Fire another three-shot group from the same stable position.

Now adjust more carefully. At 100 yards, a 1/4 MOA scope moves impact about 1/4 inch per click. A 1/2 MOA scope moves impact about 1/2 inch per click. If your 100-yard group center is 3 inches low and 2 inches left:

• With 1/4 MOA clicks: dial 12 clicks up and 8 clicks right.
• With 1/2 MOA clicks: dial 6 clicks up and 4 clicks right.

Shoot another three-shot group. If the center is now on your aim point, you are close enough to confirm. If not, measure again and repeat.

Step 6: Confirm with five shots

Three-shot groups are good for adjustment. Five-shot groups are better for confirmation.

When the three-shot group is centered, fire five shots at a clean target. Do not rush. Keep the same cheek weld and press the trigger the same way each time.

If the five-shot group center is where you aimed, your scope is sighted in. If the group is centered but larger than expected, that is probably shooter, ammo, barrel, or rest. If the group is tight but off center, make one final correction.

Step 7: Set your turret reference and write it down

Many scopes let you loosen the turret cap and reset the visible "0" mark without changing the actual adjustment. Do that after your final zero if your scope allows it.

Then write down the rifle, scope, mount, ammo, zero distance, date, final group size if measured, and any odd conditions. If the rifle prints 2 inches right next month, you have real data.

How Scope Click Math Works

Scope click math is distance divided by the value of each click at that distance. The quick formula:

Correction in inches divided by inches per click equals clicks to dial.

For a 1/4 MOA scope, one click is about 1/16 inch at 25 yards, 1/8 inch at 50, and 1/4 inch at 100. For a 1/2 MOA scope, one click is about 1/8 inch at 25 yards, 1/4 inch at 50, and 1/2 inch at 100.

Here is a normal 100-yard example. Your group is 4 inches low and 1 inch right. With 1/4 MOA clicks, dial 16 clicks up and 4 clicks left. With 1/2 MOA clicks, dial 8 clicks up and 2 clicks left.

At 25 yards, the same 4-inch correction takes more clicks because the angular movement is smaller on the target. With 1/4 MOA clicks, 4 inches at 25 yards is roughly 64 clicks. That is why 25 yards is for rough alignment and 100 yards is for the real zero.

What Distance Should You Sight In a Rifle Scope?

For most rifle scopes, sight in at 100 yards unless you have a specific reason not to. A 100-yard zero is easy to confirm at most outdoor ranges, keeps short-range offset predictable, and gives you a clean baseline for holdovers or turret dialing.

Use 25 yards as the first live-fire step, not the final zero unless you mean it. Use 50 yards when your reticle, trajectory plan, or range access calls for it. Use 200 yards or farther only for a deliberate ballistic reason, such as a hunting zero or maximum point blank range.

Fixed magnified optics fit the same pattern. The Rhino 4x Magnified Optic is a fixed 4x optic that mounts to a standard Picatinny/1913 rail and uses an etched reticle with holdover references. One verified Rhino buyer put the practical side plainly: "Had to zero at 100 yds of course, but once I did that it was great." That quote came from the Rhino 4x review corpus, n=54, source review ID 7703502.

Common Rifle Scope Zeroing Mistakes

Most zeroing problems are not mysterious. They come from one of these.

Chasing single shots

One shot can be you, wind, a bad round, or the rifle settling into the bag. Adjust from group center. Three shots minimum for correction, five for confirmation.

Turning the turret the wrong direction

Read the turret as point-of-impact movement. If the group is low, dial toward "UP." If the group is left, dial toward "R." Think about where the next bullet impact needs to go.

Calling 25 yards good enough

A 25-yard zero can be useful, but it is not the same as confirming at 100. The bullet is still crossing your line of sight at close distance. Small errors at 25 can turn into annoying misses farther out.

Use 25 to get on paper. Use 100 to finish.

Ignoring the mount

A loose mount makes a good scope look bad. If your group walks around the paper after each adjustment, stop and inspect the base, ring screws, rail clamp, and scope tube. A paint pen witness mark makes movement obvious later.

Our Razorback review corpus has a simple buyer note that matches the normal experience when the hardware is right: "Mounted on a Bushmaster AR and zeroed quite easily. Crisp glass." That is from the Razorback 1-6x24SFP corpus, n=9, source review ID 50807468.

Changing ammo after zeroing

Different bullet weights and loads can hit in different places. If you zero with 55-grain range ammo and hunt with a different load, confirm with the hunting load. A zero belongs to the load you used.

Fighting eye position and parallax

Magnified scopes punish sloppy head position more than red dots. Set your eye relief before zeroing, keep your cheek weld repeatable, and avoid creeping forward on the stock. If your scope has a parallax adjustment, set it for the distance you are shooting.

Forgetting to document the result

Write down the rifle, scope, ammo, distance, date, and final turret index. That one note turns the next range trip from a mystery into a quick confirmation.

How to Zero a Scope vs a Red Dot

The basic process is the same: shoot a group, measure from group center, adjust point of impact, confirm.

The differences matter.

A rifle scope has magnification, eye relief, a reticle, and usually finer click values. You can see the target better and dial more precisely, but you need a consistent cheek weld. A red dot is faster and more forgiving of head position, but the dot covers more of the target at distance and the adjustments may be coarser.

If you are working on a dot instead of a scope, use our sibling guide on how to zero a red dot. It covers dot-specific distance choices, brightness bloom, and close-range offset.

Bottom Line

Sight in your rifle scope in stages: bore sight, 25-yard group, rough correction, 100-yard group, precise correction, five-shot confirmation. Use group center, do the click math, then document the zero.

If you want one optic that fits this workflow on a flat-top AR, the Razorback 1-6x24SFP Rifle Scope keeps the setup straightforward: 1-6x power, included mount, illuminated Mil Dot reticle, push-lock turrets, 1/2 MOA clicks, waterproof and fog-proof build, 1000G impact resistance, and our NO B.S. Lifetime Warranty.

Get the hardware tight, shoot honest groups, and let the target tell you what to dial.

Frequently Asked Questions

Q: What distance should I sight in a rifle scope?

A: Start at 25 yards to get on paper, then confirm your final zero at 100 yards. A 100-yard zero is the clean baseline for most hunting rifles, LPVOs, and fixed magnified optics unless your scope manual, reticle, or use case calls for something else.

Q: Can you bore sight a rifle scope without shooting?

A: You can bore sight without shooting, either with a laser bore sight or by looking through the bore on a bolt-action rifle, but that is only rough alignment. It helps your first live round land on paper. It does not replace live-fire zeroing.

Q: How many clicks is 1 inch at 100 yards?

A: On a 1/4 MOA scope, 1 inch at 100 yards is about 4 clicks. On a 1/2 MOA scope, it is about 2 clicks. Check your turret first because click values vary by optic.

Q: Why is my scope not holding zero?

A: A scope that will not hold zero usually has movement somewhere in the system. Check the base, rings, rail clamp, ring screws, and action screws before blaming the optic. Also confirm you are using the same ammo and adjusting from group center.

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ARTICLE WRITTEN BY AARON RICE, GENERAL MANAGER OF OZARK ARMAMENT