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

Sighting in a magnified rifle scope means turning the elevation turret and the windage turret until the crosshair and the bullet meet at one distance. The Rhino 4x in the photo is marked for those two turrets, plus the illumination dial. The same order works on a fixed power scope or an LPVO: bore sight, shoot a group, measure from the group center, do the click math, then confirm at your zero distance.

I am Matt Rice, owner of Ozark Armament. I zero magnified scopes on shop rifles and my own guns out of our shop in Tigard, Oregon. If you are choosing the optic before you buy a box of ammo, start with our AR-15 scopes so the magnification, the mount, and the distance you actually shoot all line up.

What Sighting In a Rifle Scope Means

Point of aim is where the crosshair sits. Point of impact is where the bullet hits. A zero is the distance where those two meet for one rifle, one scope, one mount, one ammo load, and one cheek weld.

Change any of those and the zero can move. A different bullet weight, a ring that was loose, or a different place on the stock is a new setup. Confirm it. Close on paper is useful. It is a different claim from zeroed.

For most AR-15 LPVOs, fixed magnified optics, and general-purpose hunting scopes, 100 yards is the clean baseline. Use 25 yards to get the first shots on paper. Stop at 25 only when 25 yards is the distance you mean to keep.

What You Need Before You Fire

The boring kit is what saves ammunition. Bring it all before the first shot.

• The rifle, with the scope mounted and the mount screws checked
• The exact ammo you plan to use for that zero
• A stable rest: sandbags, a bipod, or a front bag and a rear bag
• Paper targets with a small aiming point, or a grid
• A ruler or the grid, so you measure inches instead of guessing
• The tool for your turret caps, if the caps need one
• A notebook or a phone note for the final zero
• Eye and ear protection

A plain bullseye works. A grid is faster, because you can read the inches without a tape. NSSF offers free printable targets as PDF files for standard 8.5 x 11 paper.

Check the mount before live fire. Ring screws and base screws get snugged to the mount maker's published torque. On a Picatinny mount, seat the clamp fully in the slot and push the mount forward, toward the muzzle, before you tighten it. A scope that walks in the rings will not hold the clicks you dial.

How to Sight In a Rifle Scope

This is the 100-yard workflow I use on a bolt gun, an AR-15 with an LPVO, or a fixed magnified optic. If your final zero is 50 yards, the order stays the same and the click values change with the distance.

Step 1: Bore sight first

Bore sighting lines the scope up roughly with the bore before you fire. It is rough alignment. It is there so the first live shots land on paper.

On 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, turn the turrets until the crosshair sits on that same spot. On an AR-15 the bore is not a straight look-through, so use a laser bore sight in the chamber or the muzzle.

Do this at 25 yards when you can. A miss of a few inches is easy to see on a close target, and you spend less ammo finding the paper than you would at 100.

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

Hang a fresh target at 25 yards. Aim at the same spot for all three shots. Leave the turrets alone after the first round unless the bullet missed the whole sheet.

Find the center of the three-shot group. That center is the point of impact you adjust from. A called flyer gets a note. It does not get to drag the whole zero with it.

Step 3: Measure from group center to the aim point

Measure how far the group center sits from the aim point, up or down, and left or right. Turret arrows are point-of-impact directions. "UP" moves the next bullet up. "R" moves the next bullet right. You dial toward the correction the group needs, which is the opposite of where the holes already are.

The diagram is a 100-yard group whose center sits 2 inches high and 1 inch right of the aim point. On a 1/4 MOA scope that correction is 8 clicks down and 4 clicks left. On a 1/2 MOA scope it is 4 clicks down and 2 clicks left.

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. According to NSSF, 1 MOA is 1/60th of a degree and equals 1.047 inches at 100 yards. At the bench, use the field rule: 1 MOA is about 1 inch at 100 yards, 1/2 inch at 50 yards, and 1/4 inch at 25 yards.

A 1/4 MOA click moves impact about 1/16 inch at 25 yards. A 1/2 MOA click moves impact about 1/8 inch at 25 yards. According to Vortex Optics, 4 clicks usually equal 1 MOA of movement. Our Razorback 1-6x turret is marked 1/2 MOA per click, so each click at 25 yards is the larger of those two steps. Get the group near the aim point. A perfect 25-yard zero is optional before you move 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 rest and the same cheek weld.

At 100 yards a 1/4 MOA click is about 1/4 inch, and a 1/2 MOA click is about 1/2 inch. If the group center is 3 inches low and 2 inches left:

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

Shoot another three-shot group. When the center sits on the aim point, you are ready to confirm. When it does not, measure again and dial once more from the new center.

Step 6: Confirm with five shots

Three-shot groups are for the adjustment. Five-shot groups are for the confirmation.

When the three-shot group is centered, hang a clean target and fire five shots. Keep the same cheek weld and press the trigger the same way each time.

If the five-shot center is on the aim point, the scope is sighted in at that distance. A centered group that is larger than the rifle usually prints is shooter, ammo, barrel, or the rest. A tight group that sits off center gets one more correction from that center.

Step 7: Set the turret reference and write it down

Many scopes let you loosen the turret cap and line the visible zero mark up with the index, without moving the internal adjustment. Do that after the final group if the scope allows it. The clicks you dial later then start from a marked zero.

Write down the rifle, the scope, the mount, the ammo, the zero distance, the date, and the group size if you measured it. If the rifle prints two inches off next month, you have a number to compare, and a reason to check the mount before you blame the ammo.

How Scope Click Math Works

Click math is one division. Inches of error, divided by inches per click at that distance, equals the clicks to dial. Read the turret first. A 1/4 MOA cap and a 1/2 MOA cap are different tools.

The field rule scales with distance. One MOA is about 1 inch at 100 yards, so a click covers one quarter of the distance's inch-value when the cap says 1/4 MOA, and one half of it when the cap says 1/2 MOA. The table is that rule at 25, 50, and 100 yards.

A 1/4 MOA click is about 1/16 inch at 25 yards, 1/8 inch at 50 yards, and 1/4 inch at 100 yards. A 1/2 MOA click is about 1/8 inch at 25 yards, 1/4 inch at 50 yards, and 1/2 inch at 100 yards.

Here is the same rule on a 100-yard group that prints 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 that same 4-inch correction takes about 64 clicks on a 1/4 MOA scope, because each click only moves 1/16 inch. That is why 25 yards is for getting on paper and 100 yards is where the zero gets finished.

What Distance Should You Sight In a Rifle Scope?

For most rifle scopes, sight in at 100 yards. A 100-yard zero is easy to confirm at a normal outdoor range, it keeps the close-range offset predictable, and it is a clean baseline if you later dial or hold for distance.

Use 25 yards as the first live-fire step. Use 50 yards when your reticle, your trajectory plan, or the range you have calls for it. Use 200 yards or farther when you have a deliberate ballistic reason, such as a hunting zero or a maximum point-blank distance you have already worked out for that load.

Fixed magnified optics follow the same pattern. One verified buyer of our Rhino 4x put the practical side plainly: "Had to zero at 100 yds of course, but once I did that it was great."

Common Rifle Scope Zeroing Mistakes

Most zeroing trouble is one of these. Fix the cause before you burn another box of ammo.

Chasing single shots

One hole can be you, the wind, a bad round, or the rifle settling into the bag. Adjust from the group center. Three shots to correct. Five shots to confirm.

Turning the turret the wrong direction

Read the cap as point-of-impact movement. A low group gets dialed toward UP. A left group gets dialed toward R. Think about where the next bullet needs to go.

Calling 25 yards the finished zero

A 25-yard group gets you on paper. The bullet is still crossing the line of sight at that distance, and a small error there grows as the target moves out. Finish at 100 yards unless 25 yards is the zero you chose on purpose.

Ignoring the mount

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

A verified Razorback buyer described the ordinary result when the hardware is tight: "Mounted on a Bushmaster AR and zeroed quite easily. Crisp glass."

Changing ammo after the zero

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

Fighting eye position and parallax

A magnified scope needs a repeatable cheek weld. Set the eye relief before you zero, and keep your eye in that same place for every shot in the group. If the scope has a parallax knob, set it for the distance on the target. Creeping forward on the stock between shots moves the apparent zero even when the turrets never moved.

Forgetting to write the result down

Rifle, scope, ammo, distance, date, and the final turret index. That note turns the next range trip into a confirmation instead of a fresh mystery.

How to Zero a Scope vs a Red Dot

This page is the magnified scope: eye relief, a reticle, and click math in fractions of an MOA. A red dot is a different sight, with no magnification and its own zero. The steps for that optic are in the sibling guide on how to zero a red dot.

After the scope zero is confirmed, holdovers and a drop chart live on the zero calculator. That page is the chart. This page is the live-fire sight-in.

Bottom Line

Bore sight, shoot a 25-yard group, make a rough correction, move to 100 yards, dial from the group center, and confirm with five shots. Write down the rifle, the ammo, and the turret index.

When you are ready to pick the optic this workflow is for, start with the best scope for AR-15 on our scopes page. Get the mount 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 the zero at 100 yards. A 100-yard zero is the baseline for most hunting rifles, LPVOs, and fixed magnified optics unless the scope manual or your use case calls for a different distance.

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

A: You can bore sight without shooting, with a laser bore sight or by looking through the bore on a bolt-action rifle. That is rough alignment so the first live round can land on paper. It does not replace a live-fire zero.

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. Read the turret cap before you dial, because click values differ by optic.

Q: Why is my scope not holding zero?

A: A scope that will not hold zero usually has movement in the mount. Check the base, the rings, the rail clamp, the ring screws, and the action screws before you blame the optic. Confirm you are still shooting the same ammo and adjusting from the group center.

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ARTICLE WRITTEN BY MATT RICE, OWNER OF OZARK ARMAMENT