Sighting-In & Zeroing

Opening morning. A buck stands broadside at 120 yards. You settle the crosshair, break the shot clean… and he runs off untouched. The rifle wasn’t broken — it was never zeroed, or the zero drifted and you never checked. A clean shot starts weeks earlier, at a bench, with a target and a notepad. This lesson is that bench session.

Safety check

Quick recall from Safety First — before you ever load at the bench, where must the muzzle always point?

Quick recall from Safety First — before you ever load at the bench, where must the muzzle always point?

In a safe direction — downrange, at the backstop Straight down at your feet Anywhere, as long as the safety is on

Check answer

What “zero” actually means

A zero is the one distance where your line of sight and the bullet’s path cross — so where you aim is where you hit. Sight in a deer rifle at 100 yards and a dead-on hold puts the bullet at the crosshair at 100. Closer or farther, the bullet sits a little high or low; a good zero keeps that error small across your hunting ranges.

Two jobs in this lesson: (1) set and confirm that zero, and (2) choose the distance to zero at. Everything else is procedure.

Choosing your zero distance

You zero for the way you hunt, not for a number on a box.

• 100 yards is the all-purpose default for a centerfire deer rifle and what most ranges are set up for. With a typical deer cartridge, a 100-yard zero keeps you within a vital-zone-sized window from the muzzle out past 150 yards.
• Hunt tight cover or short stands? If every shot will be inside 50 yards, the NRA notes it’s reasonable to zero right where you’ll shoot — even 40 yards.
• Open country? A “maximum point-blank range” zero (often ~200 yards on flat- shooting calibers) lets you hold dead-on farther without holdover. Confirm the exact number against your cartridge and your ballistics (covered in Ballistics Fundamentals).

Pick the distance first, because it changes how you finish the process.

The why Why bore-sighting alone is never enough

Bore-sighting (laser or by looking down the bore) only aligns the scope roughly with the barrel — enough to get your first shot on paper. It does not account for how your specific ammo actually flies, your scope height, or the rifle’s real point of impact. As the manufacturers and the NSSF stress: never rely on a bore sight to “sight in.” You must confirm it with live rounds at your zero distance.

The procedure, in order

Lead with the correct sequence, then drill it. Here’s the whole bench session, start to finish:

1. Set a stable rest. A solid bench with sandbags, a bipod, or a rifle rest — front and rear support so the rifle holds steady on its own. You’re testing the rifle, not your wobble.
2. Bore-sight to get on paper. Remove the bolt, look through the bore, center the bullseye in the barrel, then — without moving the rifle — turn the scope’s dials until the crosshair sits on that same bullseye.
3. Confirm on paper at 25 yards. Fire one shot at 25 yards. If you can see where it hit, you’re on paper and ready for the real zero. (Starting close saves ammo and frustration.)
4. Move to your zero distance (e.g., 100 yards) and fire a 3-shot group, letting the barrel cool and your position settle between shots.
5. Adjust off the group’s CENTER. Find the center of the three holes. Measure how far it is from the bullseye, left/right and up/down, and dial the scope that much. (Typical scopes move ¼ inch per click at 100 yards — 4 clicks per inch.)
6. Re-shoot and confirm. Fire a fresh 3-shot group. Repeat adjust-and-confirm until the group centers on the bullseye.
7. Confirm the final zero with one last clean group from a settled position, and record it (distance, ammo, clicks). That record is your zero.

Bullseye — your aim point Group center — adjust from HERE Dial down + left to move the group to center

Run the bench session

Here is the same procedure as a checklist you can pull up at the bench. It’s ordered — work top to bottom. Tick each step as you complete it.

Sighting-in bench session (in order)

0/8

Reset

• ⚠ Safety Confirmed safe backstop, eye + ear protection on, muzzle downrange. Live fire. Four rules apply the whole time.
• Rifle set on a stable rest — front and rear support, steady on its own.
• Bore-sighted: crosshair aligned to the bullseye through the bore.
• Fired one shot at 25 yards and confirmed it's on paper.
• Moved to zero distance; fired a 3-shot group (barrel cooling between).
• Measured from the GROUP CENTER to the bullseye and dialed the scope.
• Re-shot a fresh group; repeated adjust-and-confirm until centered.
• Confirmed the final zero with one clean group and recorded distance/ammo/clicks.

Check the calls

Knowledge check

Your first 3-shot group lands as a tight cluster two inches high and one inch right of the bullseye. What do you do?

Your first 3-shot group lands as a tight cluster two inches high and one inch right of the bullseye. What do you do?

Measure from the group's center to the bullseye and dial down 2 inches and left 1 inch, then re-shoot Adjust after each single shot so you don't waste ammo Two inches is close enough — call it zeroed and go hunt

Check answer

Knowledge check

You laser bore-sighted at home and the dot looks dead-on. Are you zeroed?

You laser bore-sighted at home and the dot looks dead-on. Are you zeroed?

No — bore-sighting only gets you on paper; you must confirm with live fire at your zero distance Yes — a laser bore-sighter is precise, so the rifle is ready

Check answer

Take it to the woods

Before season, book a range session and run the protocol above end to end. Don’t leave until you have a confirmed group on the bullseye at your chosen distance, written down. Then do one more thing the bench can’t teach you:

Pre-season zero — finish like you'll hunt

0/4

Reset

• Confirmed zero at my chosen distance, recorded ammo + clicks.
• Zeroed with the EXACT ammo I'll hunt with — different loads shoot to different points. Changing ammo can move your zero inches.
• Fired a few rounds from a real field position (off sticks/pack), not just the bench. Confirms the zero survives your actual hold.
• ⚠ Safety Plan to re-check zero after travel, a bump, or a long layoff — scopes drift.

Sources

Official and authoritative references retrieved for this lesson:

• NSSF — 10 Rules of Safe Gun Handling: https://www.nssf.org/safety/rules-firearms-safety/
• NSSF — 4 Primary Rules of Firearm Safety: https://www.nssf.org/articles/4-primary-rules-of-firearm-safety/
• NRA / American Hunter — “How to Zero a Rifle”: https://www.americanhunter.org/articles/2019/6/24/how-to-zero-a-rifle
• NRA / American Hunter — “Benchrest Shooting Basics”: https://www.americanhunter.org/content/benchrest-shooting-basics/

Note: range hot/cold commands and any pre-season requirements vary by range and jurisdiction — verify locally before you go.