How to Zero an Air Rifle Scope: A Step-by-Step Method That Holds

A scope that will not hold zero is the most common reason a good air rifle shoots badly, and it is almost never the rifle’s fault. I spend my working life around precision optics, and the pattern repeats: someone buys capable glass, bolts it on in ten minutes, and then blames the pellet or the barrel when groups wander. Zeroing is not a single act of turning turrets until the pellet lands on the dot. It is a short sequence, done in the right order, on a mount you can trust. Get the order right and a zero holds for a season. Get it wrong and you will re-zero every time you go out.

What follows is the method I use and recommend. It works for a break-barrel springer and a top-tier PCP alike, with a couple of airgun-specific notes where they matter. None of it requires special skill, only patience and doing the steps in sequence.

Start with the mount, because it is the foundation

Before you touch a turret, understand that every zero you set is only as stable as the mount underneath it. The scope can be flawless and the zero will still walk if the rings are wrong. This is where most lost zeros are actually born.

Three things matter. First, torque. Ring screws have a specification, usually printed by the ring maker or the scope maker, typically somewhere around 15 to 20 inch-pounds for the tube clamp screws. Snugging them by feel is guesswork. Too loose and the scope creeps under recoil; too tight or uneven and you pinch the tube and stress the internals. A small inch-pound torque wrench costs less than a tin of premium pellets and removes the single biggest variable in the whole process. Tighten in small alternating passes so pressure stays even across the caps.

Second, alignment. The two rings need to hold the scope in a straight line without fighting each other. Modern precision rings machined to a tight standard usually mount true out of the box, but not always, and a set that is even slightly off puts a bending load on the tube. That load shows up as a zero that shifts or a reticle that cants. If you have lapping bars and see uneven contact, lapping the rings removes the high spots. Most shooters will not need to lap modern rings, but you should at least confirm the scope sits without strain before you torque it down.

Third, height and level. The mount should give you a natural cheek weld so your eye falls behind the scope in the same place every time, and the reticle should be level to the rifle, not to the horizon or to your head. A canted reticle throws shots left or right as you dial or hold over, and the error grows with distance. Use a level to set the reticle square before final torque.

On some rifles there is a fourth consideration. A few models, certain FX and RAW rifles among them, are known to shoot low enough that a standard mount runs out of elevation before you reach zero at distance. A droop-compensated or adjustable mount gives back the travel you need. If you crank the elevation turret near the top of its range just to get on at 50 yards, a droop mount is the fix, not more clicks.

Step one: get on paper with a bore-sight

With the scope mounted true, the goal of the first step is simply to get your first pellet somewhere on the target so you have something to adjust from. Firing blindly at a small target and hunting for the hole wastes pellets and patience.

If your rifle lets you see through the bore, a rough optical bore-sight works: rest the rifle solidly, look down the barrel at a target 10 to 15 yards away, center the bore on the target, then without moving the rifle adjust the scope until the crosshair sits on the same spot. A laser bore-sighter that fits the muzzle or chamber does the same job faster and works on rifles you cannot see through. Either way, this is only a coarse alignment. It gets you on paper. It is not a zero.

Set up your real target at close range for the first live shots. I like 10 to 13 yards to start, close enough that even a rough bore-sight will land on a decent-sized target. Fire a couple of shots, see where they land relative to the crosshair, and make a big correction to bring them close. Once you are hitting near the aim point at that close distance, move the target out to your zeroing distance.

Step two: set the parallax before you adjust anything

This is the step people skip, and it is the one that separates an airgun zero that holds from one that seems to move on its own. Parallax is the apparent shift of the reticle against the target when your eye moves off the optical center. If the parallax is not set for the distance you are shooting, your point of impact appears to move an inch or more just from where you put your cheek, even though the pellet is going to the same place every time. You will adjust elevation to chase a shift that is not real, and your zero will feel unstable forever.

Airguns make this worse than centerfire rifles because we shoot so close. A scope set up for 50-yard minimum parallax, which describes most repurposed centerfire glass, cannot focus at 25 yards, so the error is largest exactly where airgun shooters live. This is why a real airgun scope has side-focus parallax that adjusts down to 10 or 15 yards. If you are choosing glass, our air rifle scopes guide covers which scopes actually hold their close-focus claims.

To set it, get behind the rifle at your zeroing distance and turn the side-focus wheel until the target is crisply in focus. Then move your head slightly up, down, and side to side while watching the reticle against the target. When the reticle stays locked on the same point as your eye moves, parallax is set. If it floats, keep adjusting. Do this now, before you touch elevation or windage, and keep it set for your zero distance while you finish.

Step three: zero elevation, then windage, at close range

Now the actual zero. Set your target at 25 yards to start. Close range is deliberate: the pellet has barely begun its arc, wind has little effect, and small aiming errors on your part are magnified less, so the correction you dial in is honest. You can stretch the zero out afterward, but you build it here.

Rest the rifle as solidly as you can. A bipod or bag under the fore-end and a rear bag under the stock removes your hands as a variable. Fire a group of at least three shots, five is better, aiming at the same point each time. Read the center of the group, not any single hole, because one flier should not move your zero.

Adjust elevation first to bring the group’s center onto the vertical line of your aim point, then adjust windage to bring it onto the horizontal. Doing elevation before windage is a small habit that keeps you from confusing the two corrections. Know your turret’s click value, usually a tenth of a mil or a quarter or eighth of an MOA, and count clicks to the distance you need to move. Some scopes track exactly to spec and some are slightly off, so after you make a correction, fire another group and confirm the pellets went where the math said. Repeat until the group centers on your aim point.

A quick note on reticle and turret systems: make sure they match. A mil reticle belongs with mil turrets, an MOA reticle with MOA turrets. Mixing a mil reticle with MOA turrets is a common and maddening mistake that makes every correction a conversion problem. If you are dialing corrections during zeroing, matched units keep the process simple.

Step four: confirm the zero, then stretch it out

A zero confirmed with one group is a guess. Once the group centers at 25 yards, fire two or three more groups, ideally with a little time or a refill between them, and make sure the center stays put. If it wanders, the problem is upstream: mount torque, parallax, or a rifle whose velocity is drifting. Fix that before trusting the number.

With a solid close-range zero, move the target out to the distances you shoot. For most air rifles a 30 to 35 yard zero is a practical home base, close enough that the pellet never rises far above the line of sight and never drops too fast on either side. Shoot at 30, then 40, then 50 yards and record where the pellet lands relative to your crosshair at each. Do not re-zero at every distance. Instead, write down the holdover. That record, your own DOPE for your own rifle and pellet, is worth more than any ballistic app because it reflects your measured velocity, your pellet, and your conditions.

This is also the moment to check that your turrets track honestly if you plan to dial. Dial a known amount up, fire, confirm the pellets moved that amount, then dial back to zero and confirm they return. A scope that does not return to zero cleanly is one you want to find out about at the bench, not in the field.

Why holdover beats dialing for most air rifle shooting

Centerfire precision culture is built around dialing the elevation turret for each shot, and it works because those shooters usually know the distance and have time. Airgun shooting is different, and it changes the right approach.

Air rifle targets tend to appear fast and at mixed, close ranges. A pest at 18 yards and another at 40 yards can show up seconds apart, and the steep pellet arc means those two shots need very different holds. Counting clicks between them is too slow and too easy to get wrong under pressure. A reticle with clear holdover references lets you pick the right aim point and break the shot immediately. This is exactly why a first focal plane scope with a holdover-friendly reticle suits serious airgun work: the reticle subtensions stay accurate at any magnification, so your memorized holds are always correct. There is more on focal plane and reticle choice in the scopes guide.

Dialing still has its place. For known-distance target and field target work, where you range the target and have time to set up, dialing precise elevation is fine and often preferred. But for hunting, pesting, and general shooting, learn your holdovers and leave the turret alone. Build the holdover chart from the close-range zero you just set, tape it to your stock if it helps, and you will hit faster and more reliably than the shooter still counting clicks.

Common zero problems and what they actually are

When a zero will not hold, the cause is usually one of a short list. Knowing them saves you from blaming the scope.

The mount is not torqued to spec. This is the big one. Ring screws that are loose, or tightened unevenly by feel, let the scope shift a hair under recoil, and a hair at the muzzle is a miss at 40 yards. An inch-pound wrench and the maker’s spec fix it permanently. If your zero drifts a little every outing, check torque first.

The rings are misaligned or canted. Rings that do not hold the tube in a straight line stress the scope and can move the reticle. A reticle that is not level to the rifle throws shots sideways as range grows. Confirm alignment and level before final torque, and re-check if you ever remove and remount the scope.

Scope shift from PCP fill level. This one is not the scope at all. On a PCP, pellet velocity changes as the air pressure drops, which changes where the pellet lands. An unregulated rifle rises and falls across the fill in a curve; a regulated rifle stays flat until the pressure falls below the regulator set point, then drifts. If your zero seems to move as the session goes on, you are probably shooting off the bottom of your pressure band. Zero within the consistent part of the fill and refill before you run out of it. Understanding your rifle’s shot curve, covered in our precision air rifles guide, makes this predictable.

Temperature-driven point of impact drift. Air is a spring, and springs care about temperature. A PCP filled and zeroed on a warm afternoon can shift point of impact on a cold morning as the gas behaves differently and the regulator responds to the change. Spring-piston rifles feel it too, in the piston seal and lubrication. The drift is usually small, but on a long shot it matters. If you shoot across seasons, confirm your zero when the temperature swings rather than assuming summer’s dope holds in winter.

There is one more, specific to spring-piston and gas-ram rifles: ordinary scope mounts creep under their unique two-way recoil. Springers shove the scope forward on firing and then snap back, and that bidirectional jolt walks a scope that a PCP would never disturb. A scope stop pin or a clamp that positively locates the mount against a stop keeps it from marching down the rail. PCP shooters can ignore this; springer shooters cannot.

The short version

Mount the scope true and torque the rings to spec. Bore-sight to get on paper. Set the parallax for your distance before you adjust anything. Zero elevation then windage at 25 yards, confirm it with more than one group, then move outward and record your holdovers rather than re-zeroing. Trust holdover over dialing for the fast, mixed-range shooting airguns are made for, and when a zero will not hold, check the mount before you blame the glass.

Do that and the zero you set will still be there next time out. If you are still choosing the scope itself, start with our best air rifle scopes guide, and to understand how the rifle’s power system affects your zero, see the best precision air rifles guide. To learn how we approach this gear and why we always publish the trade-offs, read about our methodology.