How to Sight In a Crossbow at 20 Yards

Start Here: The 20-Yard Zero That Actually Works

To sight in a crossbow at 20 yards, I shoot from a solid rest, adjust the scope one small step at a time, and keep shooting until my group is tight and centered on the bull.

I do not chase single arrows.

I have been bowhunting for 25 years with a compound, but I still treat crossbows like a whole different animal.

They are easy to shoot “okay,” and easy to sight in wrong if you get sloppy.

Decide What “Sighted In” Means Before You Burn Bolts

You need to decide if you want a hunting zero or a “range day” zero.

Those are not the same thing if you shoot broadheads later.

Here is what I do for a real hunting zero at 20 yards.

I sight in with the exact bolts, nocks, and field points I plan to practice with all season.

Then I confirm with the broadheads I will hunt with, because broadheads can hit different.

I learned the hard way that mixing random bolts turns sight-in day into a guessing game.

Back in 2016 in the Missouri Ozarks on public land, I had three “identical” bolts that grouped like a shotgun because one weighed 22 grains more than the others.

Mistake to Avoid: Trying to Sight In Off Your Knee

If you are hunting from a blind, forget about sighting in off your knee and focus on a rock-solid bench or a bag rest.

A crossbow will still move under recoil, and your wobble shows up downrange.

Here is what I do.

I use a cheap front rest and a rear bag, and I keep the fore-end pressure the same every shot.

I do not death-grip the stock.

I pull it into my shoulder the same way every time, like I am trying to make it boring.

Gear Setup Tradeoff: Speed vs. Forgiveness

Fast crossbows shoot flat, but they also punish sloppy bolt matching and bad trigger pulls.

Slower setups can be more forgiving, especially for new shooters and kids.

I have two kids I take hunting now, and I would rather have them shoot a calm, repeatable setup than chase speed numbers.

My buddy swears by the fastest bolts he can buy, but I have found a mid-weight bolt groups tighter and hits harder on real deer.

My Quick Rule of Thumb

If your 3-shot group is bigger than 3 inches at 20 yards, do not touch the scope yet and fix your rest and trigger pull first.

If you see two bolts touching and one out, expect that “out” bolt to be a different weight or a damaged vane.

If conditions change to a 15 to 25 mph crosswind, switch to shooting groups of 3 from a dead-still rest and ignore single impacts.

My Exact 20-Yard Sight-In Process (Step by Step)

I hunt 30-plus days a year, and I sight in the same way every season so I do not invent new problems.

Here is what I do, step by step.

I start at 10 yards and shoot one bolt at the center.

If I am not on paper at 10, something is wrong with the mount, the scope, or me.

Then I move to 20 yards and shoot a 3-shot group at one dot.

I circle the group with a marker so I do not “remember” it wrong.

I measure how far the group center is from the bull.

Then I adjust the scope, not my aiming point.

I shoot another 3-shot group at the same dot.

I keep doing that until the group is centered and tight.

I stop once I have a repeatable group and I am not chasing perfection.

A crossbow that holds a 2-inch group at 20 is a killer.

Decision: What Target and Dot Size Should You Use?

If you use a tiny dot, you will “float” around it and over-correct your scope.

If you use a big blob, you cannot tell where your group actually is.

Here is what I do.

I use a 1-inch orange dot on a high-contrast target, and I aim dead center every time.

I do not change dots during the process.

Changing aim points mid-stream is how guys convince themselves they are dialed.

Mistake to Avoid: Adjusting After Every Single Shot

One shot can lie to you.

Three shots tell the truth.

I learned the hard way that chasing single shots burns money fast.

Back in November 1998 in Iron County, Missouri, I killed my first deer with a borrowed rifle, and my dad drilled one thing into me.

Groups matter more than hero shots.

That rule still holds with a crossbow.

How Scope Adjustments Actually Feel at 20 Yards

Most crossbow scopes move the point of impact in small clicks, but every brand is a little different.

If your scope says 1/2 MOA per click, that is about 1/10 inch at 20 yards.

That means tiny adjustments can matter.

Here is what I do so I do not lose track.

I write down my clicks on my phone notes like “Right 8, Down 4,” then I confirm with a group.

Tradeoff: Multi-Reticle Crossbow Scopes vs. Single 20-Yard Zero

Some scopes have multiple aiming points for 20, 30, 40, and 50 yards.

That is handy, but it can also trick you into thinking all the dots are perfect.

I only trust extra reticles after I verify them with real shooting at those distances.

If I only have time for one thing before season, I pick a dead-nuts 20-yard zero and hunt inside that.

Here is What I Check Before I Blame the Scope

If bolts are hitting all over, I assume it is my setup first.

Here is what I do before I touch the turrets again.

I check the scope rings and base screws with the right torque.

I have seen loose rings cost guys a whole weekend.

I inspect every bolt for cracked nocks, bent inserts, and torn vanes.

One bad vane will throw a bolt 4 inches at 20 yards.

I check brace and string condition and look for serving separation.

If the string looks fuzzy or the serving is split, I stop and fix that first.

I keep my hand below the rail.

Yes, I know, but I still say it because I have watched grown men get bit.

Product I Actually Use: A Simple Shooting Rest That Saves Bolts

I am not fancy about this.

I use a Caldwell DeadShot bag set a lot, because it is stable and it costs about $25 to $35.

It does not break, it does not wobble, and it keeps my sight-in honest.

I wasted money on gimmicky “lead sled” style setups once before switching back to bags, because the crossbow recoiled different every time I strapped it down.

Decision: Field Points First, Then Broadheads, Or Broadheads Right Away?

I start with field points because they are consistent and they do not wreck targets.

Then I confirm with broadheads, because broadheads expose tuning problems fast.

Here is what I do for hunting season.

I sight in at 20 with field points until I am centered.

Then I shoot one broadhead-tipped bolt at 20.

If the broadhead hits more than 2 inches off, I do not “just accept it.”

I pick a broadhead that flies better or I spin-check the head and replace anything that wobbles.

Mistake to Avoid: Mixing Broadhead Styles and Expecting the Same Impact

Fixed blades and mechanicals do not always hit the same spot.

My buddy swears by Rage Hypodermics, but I have found a solid fixed blade like a Slick Trick Magnum can group tighter if my bolts are matched.

That is a real tradeoff.

Mechanicals can fly like field points, but they can fail if you hit heavy bone.

Fixed blades usually penetrate great, but they can plane if your setup is off.

Two Locations That Prove Why 20 Yards Matters

On my Pike County, Illinois lease, my average shot is still 18 to 24 yards because the timber funnels tight.

That is where a clean 20-yard zero earns its keep.

In the Missouri Ozarks on public, the cover is thick and shots happen fast, and I want that first reticle perfect.

Out in Buffalo County, Wisconsin hill country, wind swirls and deer pop out at weird angles, and 20 yards is still the money distance.

Make One Smart Decision: Where You Aim While Sighting In

I aim at the same exact spot every shot and let the scope do the work.

Holding “a little high” during sight-in is how you end up a little lost during season.

This connects to what I wrote about where to shoot a deer to drop it in its tracks because your aiming system has to match a real kill zone.

A 2-inch error at 20 can be a gut hit at 30 if you get cute.

I Learned the Hard Way: Rushing Tracking Starts With Bad Sight-In

My worst mistake was a gut shot doe in 2007, and I pushed her too early and never found her.

I still think about it, and it makes me take sight-in seriously.

If you want a deeper read on the mess after the shot, this ties into my notes on how to field dress a deer because clean kills make clean work.

A bad hit turns the whole night into a sick feeling.

Decision: Do You Need to Worry About Deer “Jumping the String” With a Crossbow?

Less than with a vertical bow, but yes, deer still react.

If you are hunting pressured deer, they duck at sound, not at magic.

When I am trying to time deer movement, I check feeding times first because being set up early beats trying to rush a shot.

If I can shoot a calm deer at 20, I will take that over a twitchy deer at 35.

Tradeoff: Higher Scope Mount vs. Cheek Weld

A high scope mount can help clear parts of the rail, but it can ruin your cheek weld.

If your cheek weld changes, your point of impact changes.

Here is what I do.

I set my scope so my cheek weld is natural, then I adjust rings if needed.

I want my face to land in the same place every time without thinking.

FAQ

How many bolts should I shoot to sight in at 20 yards?

I plan on 9 to 15 shots, because I shoot 3-shot groups and adjust between groups.

If you need 30 shots, you probably have a rest, bolt, or scope issue.

Should I sight in my crossbow at 20 yards or 30 yards?

I pick 20 yards because that is my most common real shot in Pike County, Illinois timber and in the Missouri Ozarks cover.

If you shoot mostly open fields like southern Iowa edges, a 30-yard zero can make sense, but only if you actually practice at 20 and 30.

Why is my crossbow shooting left and right at 20 yards?

Most of the time it is inconsistent cheek weld, a loose scope ring, or one bad bolt with a torn vane.

I fix those before I touch the turrets again.

Can I sight in with broadheads only?

You can, but it is expensive and it hides problems because broadheads magnify small issues.

I use field points to get centered, then I confirm with the broadhead I will hunt.

What if my crossbow scope runs out of adjustment?

Your scope base or rings are probably not aligned, or the scope is damaged.

I loosen and re-seat everything, then I check the rail and base screws before I buy new parts.

Do I need to re-sight my crossbow every season?

Yes, I do, because strings creep, bolts change, and scopes get bumped in trucks.

I verify at 20 yards every fall, even if it was perfect last year.

A Few Links That Help You Make Better Sight-In Decisions

If you are trying to judge if a deer is “big enough” to risk a longer shot, I use how much a deer weighs as a reality check on body size.

If you are hunting windy ridges like parts of Buffalo County, Wisconsin, this connects to do deer move in the wind because wind changes where deer stand and how steady you can hold.

If rain hits during sight-in week, I think about where deer go when it rains so I do not waste my one good evening hunt after I finally dial the scope.

If you are new and still learning deer behavior, start with are deer smart because a “smart” deer is usually just a deer that smelled a guy who cut corners.

Next Decision: Lock Your 20-Yard Zero, Or Add Distance Marks Now?

This is where guys get ahead of themselves.

You need to decide if you are going to hunt only a 20-yard world, or if you need 30 and 40 too.

Here is what I do before I ever move back.

I shoot one last 3-shot group at 20, cold bow, first thing that day, to prove it is real.

Then I move to 30 yards and start the same group-and-adjust process on the next reticle.

Next Decision: Lock Your 20-Yard Zero, Or Add Distance Marks Now?

This is where guys get ahead of themselves.

You need to decide if you are going to hunt only a 20-yard world, or if you need 30 and 40 too.

Here is what I do before I ever move back.

I shoot one last 3-shot group at 20, cold bow, first thing that day, to prove it is real.

Then I move to 30 yards and start the same group-and-adjust process on the next reticle.

Tradeoff: Chasing 40 Yards vs. Killing Deer at 20

If you are hunting thick cover like the Missouri Ozarks, forget about bragging on 50 and focus on making 20 yards boring.

If you are hunting field edges like parts of southern Iowa, you might need 30, but you still live and die by your 20-yard zero.

I have watched guys spend $60 in bolts trying to “perfect” 40, then miss a chip-shot at 17 because their 20 was never truly locked.

Your 20-yard zero is the foundation.

Here is what I do once 20 is right.

I shoot 30 and 40 on the correct reticles, but I do not touch the 20-yard turret settings again unless something is clearly wrong.

I learned the hard way that if you keep twisting turrets for every distance, you end up with a scope that is kinda-sorta right everywhere and dead wrong where it matters.

Mistake to Avoid: “Stacking Dots” With The Wrong Speed Ring Setting

A lot of crossbow scopes have a speed ring, and guys ignore it.

Then they wonder why the 30-yard dot is money and the 40-yard dot is trash.

Here is what I do.

I set the scope speed ring to my crossbow’s real bolt speed, not the number on the box.

I confirm that speed setting by shooting 20, 30, and 40 on the correct dots and seeing if the drops line up.

If the 30 dot is hitting 2 inches low and the 40 dot is hitting 5 inches low, I do not “hold over.”

I adjust the speed ring until the dots match reality, then I leave it alone.

Decision: Do You Confirm Your Zero From a Tree Stand Angle?

If you only shoot off a bench, you are practicing for a bench.

Most deer I kill are shot from 12 to 18 feet up, not from a picnic table.

Here is what I do after I lock 20 yards on the bench.

I take one target and set it at 20, then I shoot from an elevated position with my normal hunting rest.

If I am hunting from a ladder stand, I rest the fore-end like I would on the rail, but I keep my hand below the rail and my fingers clear.

If I am hunting from a hang-on, I practice with a strap-on shooting rail or a pack strapped to the platform.

The angle usually does not change point of impact much at 20, but it exposes bad form fast.

Here Is What I Do to Keep a 20-Yard Zero All Season

I do not baby my gear, but I do protect the zero.

I have burned too many hunts because something got bumped in a truck bed.

Here is what I do.

I paint-mark my scope ring screws with a silver Sharpie so I can see if anything moved.

I keep bolts in a hard case, because loose bolts in a back seat get vanes bent and nocks cracked.

I shoot one confirmation group every two weeks during season if I can.

Even one bolt at 20 before an evening sit tells me a lot if I shoot it from a steady rest.

Back in November 2019 in Pike County, Illinois, I killed my biggest buck, a 156-inch typical, on a morning sit after a cold front.

I shot him at 21 yards, and the only reason I was calm is because I had checked my 20-yard zero two days earlier.

Product I Actually Use: A Target That Handles Crossbow Abuse

Crossbows will chew up weak targets, and that gets expensive fast.

I use the Block Classic 22 a lot for field points because it stops bolts well and it holds up better than the cheap foam cubes.

I paid about $80 for mine, and the face is still usable after a full season of groups.

I wasted money on a $29 soft bag target years ago before switching, because bolts blew through it by the second weekend and I spent more time pulling fletching out of the dirt than shooting.

Decision: What Do You Do If Broadheads Won’t Group at 20?

If your field points group and your broadheads scatter, you have a problem you cannot wish away.

Here is what I do, in this order.

I spin-test every broadhead on the bolt and I throw out anything that wobbles.

I check inserts for glue gaps and I replace cracked nocks.

I shoot one broadhead bolt and one field point bolt at 20, alternating, so I can see the pattern.

If the broadheads hit high and right every time, I do not move my scope yet.

I try a different broadhead style, because some heads are pickier on some crossbows.

My buddy swears by mechanicals for “field point flight,” but I have found some mechanicals still hit off if the ferrule is slightly bent or the blades are uneven.

If I cannot get broadheads to group inside 3 inches at 20, I stop and fix that before I hunt.

This connects to what I wrote about how much meat from a deer because a clean hit is the difference between a full freezer and a long, ugly night.

Mistake to Avoid: Forgetting Crossbow Bolts Are Part of the “Zero”

A crossbow is pickier than my compound ever was about exact bolt weight and straightness.

If you swap bolts mid-season, you can swap point of impact.

Here is what I do.

I number my bolts 1 through 6 with a paint pen and I track any “flyers.”

If bolt number 4 keeps hitting 2 inches left, I stop using it for hunting.

I keep one “practice only” bolt for the yard, and I keep my hunting bolts clean and matched.

I also keep the same style nock, because mixing half-moon and flat nocks across brands has burned people I know.

If Your Crossbow Is Loud, Make This Decision Before Opening Day

Loud crossbows kill deer, but they also make deer flinch.

If you are hunting pressured deer in Pike County, Illinois timber, I would rather take a calm 18-yard shot than gamble on a jumpy 32-yard shot.

Here is what I do to quiet things down without falling for snake oil.

I check limb bolts for proper torque, because loose hardware makes noise.

I replace worn string silencers and I wax the string, but I do not go crazy with it.

I wasted money on $400 ozone scent control that made zero difference, and that taught me to spend my money where it actually shows up on the target.

Quieting your bow and keeping a clean 20-yard zero beats any magic spray.

One More Smart Check: Confirm Your Kill Zone Picture

Zero is not just “center of paper.”

Zero is how your eye and reticle land on a deer’s chest in bad light.

Here is what I do.

I shoot one group at a deer vitals target at 20 so my brain sees the right picture.

It also keeps me honest about aim point on quartering shots.

This ties into what I wrote about what a female deer is called and what a male deer is called

A big-bodied buck can make the chest look deeper than it is, and that is how guys drift back into liver.

What I Tell Beginners, Including My Own Kids

I keep it simple because simple gets repeated under stress.

My kids do not need a scope full of math.

Here is what I do with them.

I set a big target at 10, then 20, and I only let them adjust after a 3-shot group.

I make them say out loud what they are changing, like “Right 6 clicks.”

That keeps them from panic-twisting knobs.

If you are new to all this, it also helps to read my piece on are deer smart because a lot of “smart deer” stories start with sloppy setup and rushed shots.

My Last Word on a 20-Yard Crossbow Zero

To sight in a crossbow at 20 yards, I only trust 3-shot groups from a solid rest, and I stop adjusting once the group is centered and repeatable.

Then I confirm with my hunting broadhead, and I protect that zero like it is part of my tag.

I have lost deer I should have found, and I have found deer I thought were gone.

The difference is usually not luck.

It is doing the boring stuff right at 20 yards before the season gets loud.