How to Tune a Compound Bow Sight – Complete Guide

A poorly tuned compound bow sight turns a capable bow into a guessing game. Get it right and your 40-yard pin sits exactly where it should. This guide covers the full compound bow sight tuning process: initial setup, paper tuning, sighting in at distance, and dialing each pin so it lands where you expect it to.

Why Sight Tuning Matters More Than You Think

Your bow shoots a certain arrow at a certain speed. Your sight pins represent specific distances. If those pins don’t match reality, you’re holding on a deer’s lungs and hitting its shoulder or missing entirely.

The good news: compound bow sights are straightforward to tune. No batteries, no electronics, no complicated adjustments. It’s mechanics, and mechanics are learnable.

One caveat before we start: broadhead alignment matters. If you’re switching between field points and broadheads, tune for your broadheads, because they’re what you’ll be hunting with.

What You’ll Need

Stable rest or archery vise
Paper target for tuning
Yardage markers or range finder
Screwdriver that fits your sight mount
Bow press (for removing the sight during initial mount, not for tuning itself)
Arrow testing setup: butcher paper or dedicated paper target

Most of this is common sense. The bow press is only needed if you haven’t mounted the sight yet. Once it’s on, you don’t need it for tuning.

Step 1 - Mount the Sight Solidly

The sight does nothing if it’s vibrating off zero every time you draw. Mount it with the mounting arm(s) as short as possible while keeping your line of sight clear. A long mounting arm amplifies vibration; a short one is stiffer and more consistent.

Tighten your mounting screws to spec. If you don’t have a torque wrench, snug is fine, just don’t muscle them down. Overtightening strips threads in composite risers, and that’s a problem you’ll feel every time you draw.

Check that the sight body is level. Use a small torpedo level or the one built into most quality sights. A sight that’s canted left or right makes all your pins wrong in one direction.

Step 2 - Initial Arrow Alignment (Bore Sighting)

Before you touch the sight, get your arrow roughly aligned with the target. This saves ammo and frustration.

With the sight temporarily removed or blocked from view, draw the bow and look along the arrow shaft at a target 10-15 yards away. Move the bow until the arrow appears to point directly at the target center. This is your rough bore sight.

Reinstall or unblock the sight. Your top pin should be somewhere on paper at close range, probably not centered, but close. Now you’re ready for fine adjustment.

Step 3 - Paper Tune to Check Arrow Flight

Paper tuning doesn’t tune the sight. It tunes arrow flight. If your arrows are porpoising (weaving side to side) or fishtailing (nose oscillating up and down), no sight adjustment will fix it, you need to fix the arrow’s relationship to the bow.

To paper tune:

Stretch butcher paper taut across a frame
Shoot through it from 5-7 yards with your sight blocked or removed
Examine the tear pattern

A clean bullet hole means your arrow is flying straight. A tear with ragged edges pointing consistently one direction means something in your bow’s arrow control needs adjustment, usually nock fit, brace height, cam timing, or arrow spine.

The sight’s role here is confirming the arrow flies true before you invest time dialing in pins. Skip this step and you might spend an hour sight-tuning an arrow that’s already flying wrong.

Fix arrow flight issues first. Common causes:

Nock too tight or too loose on the string
Arrow spine mismatched to your bow’s ATA speed
Brace height outside spec (check your bow’s manual)
Rest adjustment allowing the arrow to plane off the shelf

Once your arrows punch clean through paper, move on.

Step 4 - Sight In Your First Pin at 20 Yards

Twenty yards is the standard starting point. It’s close enough that wind doesn’t matter and you can see consistent groups without a range finder.

Block your lower pins or cover them with tape. You only need the top pin for now.

Shoot a 3-shot group from a steady rest. Pick up your target and measure: how far is the group center from your point of aim?

Most single-pin sights: loosen the sight’s elevation screw and move the pin up or down. For fixed multi-pin sights: adjust the entire sight body up or down on the mounting rail.

The rule: if your group hits 3 inches low, raise the sight 3 inches. If it hits 2 inches high, lower it. You’re adjusting the sight, not the arrow.

For windage, same idea: move the sight in the direction you want the arrow to go. If your group is 1 inch left of POA, shift the sight right by 1 inch.

Write down your corrections. “Raised 2.5 inches, moved right 1 inch” is better than eyeballing your way to a zero.

After each adjustment, shoot another 3-shot group. Small corrections, one inch at a time, get you to zero faster than big swings.

Step 5 - Dial In Each Pin at Its Distance

Once your 20-yard pin is locked, it’s time to set the rest. There are two types of sights and the process differs for each.

Single-pin adjustable sights are simpler: dial the pin to 20 yards and zero it, then dial to 30 yards and repeat. Each pin position is independent. Work your way out in 10-yard increments until you’re past your effective hunting range.

Fixed multi-pin sights require you to sight in at a reference distance, then use the manufacturer’s pin spacing (typically measured in MOA or inches per hundred yards) or your own observed drop data to set the remaining pins.

Here’s the practical method for fixed pins without a fancy range finder:

Zero your top pin at 20 yards
Walk back to 30 yards, don’t adjust the sight, and shoot at the same target
Note where the 20-yard pin sits relative to your point of aim
Adjust the second pin to that position by moving the sight body on its rail
Repeat for 40 yards with the third pin, and so on

You’ll find that the spacing between pins isn’t linear. The gap between 20 and 30 yards is wider in terms of bullet drop than the gap between 30 and 40 yards. Most sight manufacturers space pins to match typical arrow drop, so your pins should naturally spread as yardage increases.

Shoot each distance at least 3 times before committing. A flier will send you chasing a ghost.

Step 6 - Verify Pin Spacing Across Your Effective Range

Once all pins are set, walk through your yardages from 20 to your farthest pin. At each distance, confirm that when you aim at the target center, your group is centered or within an acceptable margin, about 2 inches at typical hunting distances.

If a pin consistently shoots outside that window, revisit your arrow flight (step 3). A pin that won’t hold zero almost always means the arrow isn’t flying true, not that the sight is faulty.

Troubleshooting Sight Problems

All pins group consistently but off-center at every distance. This is a windage issue with the entire sight body. Loosen the windage screws and shift the whole sight in the direction of the error. One adjustment fixes it across all pins.

One pin is way off; others are close. Something is bumping that pin. Check for:

Rest pressure plate contacting the arrow at full draw
The arrow sliding off the rest shelf at draw
The sight’s pin track having slop or being damaged

Screw the sight mounting rail more firmly, a loose mount can shift under draw weight.

Your groups open up at longer distances but are tight close. This is almost always arrow spine. A spine that’s too weak for your bow’s speed will flex excessively at release, causing wider groups at distance. Heavier arrows or a stiffer spine will tighten groups. Talk to your arrow manufacturer, they can often suggest a spine upgrade based on your bow’s specs.

The sight tracks fine but won’t hold zero between sessions. Check your mounting screws. Composite risers can compress over time; check and re-torque if needed. Also check for any movement in the mounting rail, a shim or washer might be needed to take up play.

Protecting Your Setup

After you have a clean zero, mark your sight positions. Most hunters use a silver Sharpie on the sight body or a small piece of tape with written yardages. Some sights have laser-etched scales, those are worth what they cost.

Don’t rely on memory. Write it down: pin 1 at 20 yards, pin 2 at 30 yards, and so on. If your sight gets bumped or you remove it for travel, you want a reference.

When transporting your bow, remove the sight or use a quality bow case with sight protection. A sight knocked against a hard case can shift your windage without visible damage to the sight itself.

Final Thoughts

Compound bow sight tuning is a process you work through once, then verify before each season. The setup takes a couple hours your first time, shooting, measuring, adjusting, repeating. Once it’s done, you trust it.

The part most guides skip is paper tuning first. Getting your arrow to fly straight means every sight adjustment actually means something. Without that step, you can spend an evening chasing a problem that lives in arrow flight, not pin height.

Set it up right, tune the arrow flight first, sight in at 20 yards, and walk your pins out. That’s the whole process. Now get to the range.