How to Adjust a Crossbow Scope to Hit the Bullseye?

Which knob controls up and down versus left and right?

Unscrew the metal caps covering your scope dials to expose the thumb-dials underneath. You will see two adjustment turrets on the center tube of your scope. The top knob controls the up-and-down adjustment, which manuals label elevation. The knob on the right side controls side-to-side movement, which manuals label windage.

Each dial features stamped letters, numbers, and directional arrows. The top dial displays an arrow pointing toward the word "UP." Turning this dial in the direction of the arrow raises your arrow impact point on the target. Turning it the opposite way lowers the impact point so your next arrow hits lower.

The side knob displays an arrow pointing toward the letter "R" for right. Turning this side dial in the direction of the arrow moves your arrow impact to the right. Turning it backward pushes your arrow impact to the left.

These adjustment dials steer where the arrow hits, not where the crosshairs point. When you look through the glass, your aiming lines remain steady. Turning the knobs shifts internal lenses so the arrow lands where you aim. Turning a knob toward "UP" tells the arrow to land higher on the target board.

How do you set up your shooting bench safely?

Sighting in your crossbow requires a solid foundation and careful handling before you touch the trigger. Wobble from your arms or shoulders ruins your adjustments before you start.

• Select a safe backstop: Pick an open area with a dense foam archery target designed for high-speed crossbow arrows. Place the target in front of an earthen hill that catches stray bolts if you miss the target face.
• Measure the exact distance: Use a tape measure or a laser rangefinder to set your target exactly 20 yards away from your bench. Sighting in at 20 yards provides a dependable baseline that matches the primary aiming dot inside almost every scope.
• Lock the bow in a steady rest: Rest your crossbow across sandbags, a shooting sled, or an adjustable shooting bench bipod. A firm rest removes human tremors and reveals genuine arrow flight without pulled shots.
• Flex carbon arrows to check for damage: Bend each carbon bolt gently by hand and listen closely for cracking sounds before loading. Shooting a cracked arrow can shatter the shaft during launch, flinging sharp carbon splinters into your hands.
• Prevent dry fire accidents: Never release the bowstring without an arrow loaded securely in the rail track. Firing without an arrow absorbs zero energy, which can shatter bow limbs, break cams, and fling sharp parts across the shooting area.
• Seat the arrow tight against the string: Slide your bolt along the barrel flight rail until the nock touches the bowstring completely. An unseated arrow leaves a small gap that can cause a partial dry fire or ruin your group.

Which way do you turn the dials after shooting?

Adjusting your scope is a gradual walking process where you nudge arrows closer to the bullseye in small steps.

1. Shoot a three-arrow group: Aim the top crosshair directly at the center bullseye. Squeeze the trigger smoothly three times without shifting your rest position. Never adjust dials after a single shot, because a small flinch can make one bolt wander on its own.
2. Locate the center of your arrow cluster: Walk to the target and find the middle point between your three arrows. You will make all dial turns based on the center of this group rather than chasing single arrow holes.
3. Fix the up-and-down error first: If your cluster lands three inches below the center dot, take off the top cap. Turn the up-and-down adjustment knob toward the "UP" arrow to lift arrow impact. If your arrows land high, turn the top dial opposite the "UP" arrow to drop them.
4. Correct the side-to-side error second: Check your horizontal spread. If arrows land two inches left of center, turn the side knob toward "R" to push impact right. If they hit right of center, turn the dial away from "R" to move impact left.
5. Confirm with three more shots: Cock your bow evenly, load fresh arrows, and aim at the bullseye again. Fire another three-arrow group to confirm that your adjustments put the cluster right in the middle.

How many clicks move your arrow impact one inch?

Scope knobs make distinct clicks as you turn them with your fingers. Each click turns an internal screw that tilts the internal reticle lens a tiny fraction of an angle. The exact movement per click is stamped on the dial face or inside the protective screw cap.

Most crossbow scopes feature dials marked as 1/4 MOA or 1/2 MOA. These markings mean minute of angle, which measures how far arrow impact moves at 100 yards. A 1/4-inch click moves impact 1/4 inch at 100 yards, while a 1/2-inch click moves impact 1/2 inch at that distance.

Because you are sighting in at 20 yards, your target is five times closer than 100 yards. That closer distance divides the movement of each click by five. If your scope uses 1/4-inch clicks, one click moves your arrow impact only 1/20 of an inch at 20 yards. It takes roughly 20 clicks to move your arrow impact one inch on the target. If your arrows land two inches low, you must turn the top knob about 40 clicks in the "UP" direction.

If your scope uses 1/2-inch clicks, each click moves your arrow 1/10 of an inch at 20 yards. It takes 10 clicks to move the bolt one inch across your target face. Count each click out loud while turning so you never lose your place.

How does the speed ring work on longer shots?

Many crossbow scopes feature multiple horizontal crosshairs or stacked aiming dots. These extra lines let you aim cleanly at 30, 40, and 50 yards without twisting knobs in the field. Crossbow arrows drop quickly, and that drop depends directly on bow power and arrow weight.

A speed ring is a rotating collar near the rear eyepiece of your scope. This collar changes magnification slightly, which widens or narrows the physical gap between your stacked aiming lines. Turning the speed dial matches reticle spacing to the exact arrow velocity of your bow.

To set the speed ring, begin by matching the collar number to the manufacturer speed rating of your crossbow. Lock in your primary 20-yard zero using the top crosshair and standard adjustment knobs. Many hunters who pick up a high-performance model with an included sight, such as a TenPoint TX Ultra 265 package, find that calibrating arrow drop takes only a few minutes once the top crosshair is locked in.

Once your 20-yard crosshair hits the bullseye, step back to 30 or 40 yards. Aim at the target center using your corresponding 30-yard or 40-yard aiming line. If your arrow lands lower than your aiming point, your arrow is flying slower than the dial says. Turn the speed ring slightly lower to widen the gap between your crosshairs. If your arrow hits high, turn the speed dial to a higher number to bring the lines closer together.

Why are your arrows still missing the center spot?

If your arrows scatter across the target board despite endless dial adjustments, the scope dials might not be the problem. Mechanical issues on the bow or loose hardware can prevent arrows from grouping. Run through this quick checklist before touching your dials again.

• Loose scope rings or rail screws: Check every screw connecting the scope rings to the sight rail. Crossbow vibration easily rattles screws loose. Tighten mounting screws evenly with a proper wrench so the optic cannot shift during the shot.
• Uneven cocking rope tension: If you draw the bowstring using a manual rope cocker, ensure the hooks pull evenly from both sides. Drawing the string even 1/8 inch off-center causes arrows to veer left or right randomly. When tuning modern gear, like choosing the best TenPoint crossbow for hunting, pairing proper cocking form with a solid rest makes all the difference.
• Mixed arrow weights and vanes: Shoot matching bolts with identical grain weights and fletching styles. Firing an arrow that weighs 400 grains alongside one that weighs 425 grains causes vertical stringing that no scope dial can fix.
• Tilting the bow limbs: Keep your crossbow limbs completely level when aiming. Tilting the bow to the left or right, known as canting, pushes your arrow low and wide in the direction of the lean.
• Damaged arrow nocks: Examine the rear nock of every bolt for chips or cracks. A warped nock slips unevenly against the bowstring, throwing the shaft off course the moment you pull the trigger.

FAQs

Should you sight in at 10 or 20 yards?

Starting at 20 yards is the standard practice for modern crossbows because it aligns with the top aiming crosshair. Sighting in closer, like 10 yards, makes adjustments overly sensitive and hides flight instability. If you worry about missing the target entirely on your first shot, take one initial shot at 10 yards to confirm your bolt hits the foam before backing up to 20 yards.

What should you do if you run out of clicks?

If your adjustment knob stops turning before your arrow reaches the bullseye, stop turning immediately to avoid stripping internal gears. Running out of adjustment travel almost always means your scope rail or rings sit crooked on the frame. Loosen the mounting base, inspect the rail for burrs or debris, realign the rings, and re-tighten the screws to reset your adjustment range.

Can you adjust your scope without firing real arrows?

You can use a laser bore sighter inserted into the barrel or mounted along the arrow rail to get crosshairs close to center before shooting. A laser sighter shows rough alignment, but it cannot account for real arrow drop, bowstring vibration, or broadhead drag. You must always confirm and fine-tune your settings with real practice shots into a target before hunting.

How often do you need to check your scope settings?

Check your scope alignment at the start of every hunting season and after traveling long distances by truck or plane. Bumps against tree branches, extreme temperature shifts between hot storage and cold woods, and vehicle vibration can loosen mounts or shift your zero point. Firing three confirmation arrows before each hunt gives you total confidence in your aim.