A rifle scope is only as accurate as the shooter who sights it in. Whether you just mounted a brand-new optic or your point of impact has drifted after a rough hunting season, knowing how to sight in a rifle scope is one of the most important skills any shooter can develop. A properly zeroed scope means tighter groups, cleaner hunts, and far less ammunition wasted at the range.In this guide, we’ll walk through the entire process from bore-sighting to fine-tuning your zero at 100 yards so your next trigger pull lands exactly where you want it.What Does “Sighting In” a Rifle Scope Actually Mean?
Sighting in, also called zeroing, is the process of aligning your scope’s reticle with your rifle’s true point of impact at a specific distance. When your point of aim matches your point of impact at that distance, your rifle is “zeroed.”Most hunters and target shooters zero their rifles at 100 yards because it offers a practical balance between trajectory drop and real-world shooting distances. However, you’ll usually start the process at 25 yards to get on paper before moving back.
What You’ll Need Before You Start
Before heading to the range, gather the following gear:
- A stable shooting rest, sandbags, or bipod
- Your rifle with a properly mounted scope and torqued scope rings
- Quality ammunition of consistent bullet weight (don’t mix loads)
- Paper targets with a clear aiming point
- A spotting scope or binoculars
- Hearing and eye protection
- A small screwdriver or coin for turret adjustments
Consistency is everything. The same ammunition with the same bullet weight will give you reliable, repeatable groups which is the foundation of a good zero.
Mount and Level Your Scope Properly
A scope that isn’t mounted correctly will never hold zero. Make sure your scope rings are torqued to the manufacturer’s specifications, your reticle is perfectly level with the bore, and your eye relief is set so the sight picture is clear and edge-to-edge.If you’re starting fresh, choosing a quality optic makes a huge difference. Scopes like the
SIG TANGO MSR 2-12×40 or the
Leupold VX-3HD 2.5-8×36 both available at
Desperate Measures Firearms offer crisp glass, repeatable turret tracking, and the kind of mechanical reliability that makes the sighting-in process smooth instead of frustrating.
Bore-Sight First to Save Ammunition
Bore-sighting gets you on paper before you ever fire a shot. For a bolt-action rifle, remove the bolt and look down the barrel toward a target placed about 25 yards away. Center the bore on the bull’s-eye. Without moving the rifle, adjust the scope’s windage and elevation turrets until the reticle is also centered on the bull’s-eye.For semi-autos where you can’t see down the bore, a laser bore-sighter inserted in the chamber or muzzle accomplishes the same thing.
How to Sight In a Rifle Scope at 25 Yards
Starting at 25 yards is the smartest approach for new optics. At this short distance, your shots will almost certainly land on paper, even if bore-sighting was rough.Here’s how to sight in a rifle scope at 25 yards:
- Set up a target at exactly 25 yards.
- Fire a three-shot group from a stable rest, taking your time between shots.
- Measure the distance from the center of your group to the bull’s-eye.
- Adjust your turrets according to the scope’s click value (usually 1/4 MOA per click, which equals about 1/16 inch at 25 yards).
- Fire another three-shot group to confirm.
A 25-yard zero corresponds roughly to a 100-yard zero for most common centerfire rifle cartridges, which is why this method is so popular. It saves ammunition, time, and walking back and forth between the bench and the target.
How to Sight In a Rifle Scope for 100 Yards
Once your 25-yard group is centered, move your target out to 100 yards. This is the gold standard distance for confirming your final zero.Follow these steps to dial in your 100-yard zero:
- Fire a three-shot group at the 100-yard target from a solid rest.
- Let the barrel cool between groups to avoid heat-induced flyers.
- Measure how far your group’s center sits from your point of aim.
- At 100 yards, one click on a 1/4 MOA scope moves your point of impact about 1/4 inch.
- Adjust elevation and windage accordingly.
- Fire another confirming group, then a final group to verify.
For long-range setups where you want to reach out to 200 yards or further, a high-magnification optic such as the Trijicon AccuPoint 2.5-10×56 gives you the clarity and adjustment range needed to confidently extend your zero beyond 100 yards.
How Do You Zero a Rifle Scope Without Wasting Ammo?
If you’re wondering how do you zero a rifle scope efficiently, the answer is simple: shoot groups, not single shots. A single round can be misleading flinch, breathing, or trigger control might pull it off target. Three-shot groups reveal your true point of impact and let you make confident adjustments.Other tips to save ammo and time:
- Always shoot from the same rest and the same position
- Keep your cheek weld and grip consistent across every shot
- Let the barrel cool between groups
- Use the same lot of ammunition with identical bullet weight
- Record your settings in a notebook for future reference
Understanding MOA vs. MIL Adjustments
Most scopes adjust in either MOA (Minute of Angle) or MIL (Milliradian). On an MOA scope, 1/4 MOA per click moves the point of impact about 1/4 inch at 100 yards. On a MIL scope, 0.1 MIL per click moves the point of impact about 0.36 inch at 100 yards. Read your turret markings carefully making the wrong adjustment is one of the most common mistakes shooters make.
Confirming and Maintaining Your Zero
Once your point of aim matches your point of impact, don’t pack up yet. Fire one final confirmation group, then check the torque on your scope rings and base. Vibration from recoil can loosen things over time, especially on hard-recoiling rifles.It’s also smart to verify your zero at the start of every hunting season or shooting trip. Bumps during transport, temperature swings, and even changes in ammunition lot can shift your point of impact slightly.
Final Thoughts
Learning how to sight in a rifle scope properly transforms how you shoot. It builds confidence, tightens groups, and ensures that when the moment counts whether it’s a buck at 200 yards or a steel plate at the range your bullet lands exactly where the crosshairs say it will.If your current optic isn’t holding zero or just isn’t giving you the clarity you need, browse the full lineup of premium rifle scopes and optics at Desperate Measures Firearms. From budget-friendly red dots to long-range precision scopes, the right optic makes all the difference between a frustrating range day and a perfectly placed shot.
