Last month a guy came into the shop with a brand-new scope mounted crooked on a rifle he’d bought secondhand, three boxes of ammo already burned through, and no idea why he couldn’t hit a paper plate at 50 yards. That’s the most common story I hear behind the counter. Folks buy a good rifle, drop real money on glass, then treat the zeroing process like an afterthought. It isn’t. Learning to zero a rifle scope properly is maybe the single most important skill a new rifle owner needs, and it’s not complicated once somebody walks you through it once.
I’m not a competition shooter, I’ll say that up front. I work storage and home defense mostly, but I’ve mounted and zeroed more scopes for customers and for my own guns than I can count, and I’ve watched people make the same mistakes over and over. So this is the version I’d actually tell you at the counter, not a textbook version.
Get the mount right before you touch a turret #
Zeroing starts before you ever load a round. If your scope base and rings aren’t torqued evenly, or the scope isn’t level in the rings, no amount of turret clicking will fix it downrange. I use a bubble level on the rifle’s action and another on the scope’s turret cap to make sure everything’s square before I even think about ammo. Skipping this step is the number one reason people “can’t get a zero” — they’re not shooting a level rifle, so their groups walk sideways every time they adjust for elevation.
Check your ring screws are torqued to spec, usually somewhere around 15-18 inch-pounds depending on the manufacturer, and go in a star pattern like you would with lug nuts. If you don’t own a torque wrench yet, that’s a fair first accessory purchase, honestly it’s cheaper than replacing a scope you cranked too tight and cracked the tube.
Bore sighting saves you a box of ammo #
Bore sighting isn’t a substitute for a real zero, but it gets you on paper faster so you’re not wasting rounds walking shots onto a target from three feet off. For a bolt gun, pull the bolt, look down the bore at a target 25 yards out, and adjust the scope’s turrets until the reticle lines up with what you’re seeing through the bore. It’s crude but it works.
A laser bore sighter that fits in the chamber does the same job faster and works on rifles where you can’t see down the bore easily, like most semi-autos. Either way this step is about getting rounds on the paper at 25 yards, not about being precise. Precision comes next.
Start close, then stretch the distance out #
I always tell first-timers: start at 25 yards, not 100. At 25 yards almost every shot lands somewhere on a standard target, which means you can actually see your group and make real adjustments. Trying to zero cold at 100 yards off the bat is how people burn a whole box of ammo chasing a group they can barely see.
Shoot a three-shot group from a stable rest, bags or a bipod, whatever gets the rifle steady so the group represents your rifle and not your shaky hands. Read the center of that group relative to your point of aim, then dial your turrets to move the reticle toward center. Most scopes move in 1/4 MOA or 1 click increments per some fraction of an inch at 100 yards, so the math scales differently at 25. If you’re fuzzy on MOA versus MRAD, that’s worth reading up on separately, our piece on MOA vs MRAD reticles breaks down what each click actually moves and why it matters at different distances.
Once you’ve got a tight group centered at 25 yards, move the target out to 100. That’s the real test. Shoot another three-round group, adjust again, and confirm. Some folks stop at 50 yards and call it good, and for certain guns that’s fine, but for anything you’re using at real hunting distances I want that final confirmation at 100.
Reading your group without lying to yourself #
This is where people get sloppy. A called flyer, a gust of wind, a bad trigger pull, these things happen and they’ll throw a shot outside your group. If you had one shot land two inches off from the other two, and you know you jerked the trigger, don’t let that shot drag your average off. But if all three are scattered wide, that’s not a called flyer, that’s your rifle or your rest telling you something’s wrong, so don’t adjust the scope based on a group that isn’t actually representing what the gun does.
I’d rather see someone shoot five rounds and throw out the worst two honestly than shoot three and treat every flier as real data. Ammo matters here too — zero with the actual load you’re going to hunt or defend with, not the cheapest bulk stuff on the shelf, because point of impact shifts between loads more than people expect.
Wind, position, and the stuff that isn’t the scope’s fault #
A lot of “the scope won’t hold zero” complaints I hear are actually shooter position problems. Cheek weld changes, grip pressure changes, and suddenly the group opens up and the customer assumes the scope’s busted. Before you blame the glass, shoot from a consistent rest and a consistent position, same cheek weld every time, same hand pressure. If your zero still wanders after that, then we talk about the scope itself, or the mount, or the barrel.
Wind at 100 yards can push a light bullet enough to matter, especially with smaller calibers. If you’re zeroing on a breezy range day and can’t get a calm window, know that your zero might be slightly off true and plan to confirm again on a calmer day before you trust it for something serious like a hunt.
What a solid mount and rest actually buy you #
I keep coming back to fundamentals because that’s genuinely where zeroing lives or dies, plain and simple. The scope, the ammo, the rifle, none of it matters if your fundamentals underneath are shaky. That’s the same principle behind good pistol shooting too, our guide on grip and stance for pistol shooting covers a lot of the same “get your base right first” thinking, just applied to a handgun instead of a rifle rest.
If you’re working with a new rifle and you haven’t settled on a scope yet, magnification range matters more than people think going in — a 3-9x might be plenty for whitetail woods but come up short for open desert shots. We cover that decision in our piece on choosing hunting scope magnification, worth a read before you buy rather than after.
Confirming zero holds before it counts #
Once you’ve got a confirmed 100-yard zero, don’t just walk away satisfied. Shoot it again a week later, and again before hunting season opens, because scopes do occasionally shift, mounts loosen, and a bump during transport can move things more than you’d expect. I tell every customer the same thing: confirm zero before opening day, not during it. According to NSSF’s hunter education materials, a huge share of missed shots in the field trace back to equipment that wasn’t checked recently rather than shooter error on the day, which lines up with what I see at the range constantly. Take a look at NSSF’s safety and training resources if you want more on pre-season prep beyond just the scope.
I’ll admit I got sloppy about this myself a few seasons back, skipped a confirmation shoot because I was pressed for time, and paid for it with a low miss on an opening morning I still think about. Lesson learned the hard way, so now I don’t skip it regardless of schedule.
When to walk away from a scope entirely #
Here’s my mildly unpopular opinion: if a scope won’t hold zero after you’ve ruled out mount, rest, and ammo variables, stop troubleshooting it and send it back or replace it. I see people spend weeks chasing a zero on a scope that’s simply defective internally, when the honest move is to cut losses. A $150 scope that won’t track reliably isn’t worth the ammo and range time you’ll dump trying to save it. That’s not the popular advice at some counters, since it’s easier to keep selling adjustment tips, but it’s the right one.
For anyone still assembling their setup, our first-timer’s checklist before you hit the gun shop covers a lot of what to ask before you even get to the range, and it’s worth reading before you drop money on a scope-and-rifle combo you haven’t researched. The ATF’s guidance on responsible firearm handling is also a good baseline reference if you’re new to all this, available at ATF.gov’s firearms resources page.
Zeroing isn’t glamorous work. It’s cold mornings at the bench, three-shot groups, small turret clicks, and repeating it until the rifle does what you tell it to do. No shortcuts on safety, and honestly no real shortcuts on zeroing either — the process takes what it takes, and rushing it just means you’re back at the bench next weekend doing it again.
— Tasha Odom, Home Defense & Storage Editor