How to Sight In a Crossbow Scope
How to sight in a crossbow scope step by step: bore-sighting, distance-marker adjustment, and confirming zero before hunting season.
Why Sighting In Matters More Than the Scope Itself
Even the most accurate crossbow scope is only as good as its calibration to your specific crossbow, bolt weight, and shooting style. A scope straight out of the box is not sighted in for your setup, and skipping this process means every shot downrange is essentially a guess. This guide walks through the full sight-in process step by step, whether you're mounting a budget optic or a premium multi-reticle scope like the ones in our reviews.
Our Top Picks at a Glance
| Scope | Reticle Type | Price | Best For |
|---|---|---|---|
| TruGlo 4x32 Compact | BDC/Rangefinder, illuminated | $69–$99 | Straightforward single-reference sight-in |
| TenPoint RangeMaster 100 | 9-point illuminated | $295–$355 | Multi-distance calibration practice |
| Garmin Xero X1i | Auto-ranging digital | $949–$999 | Minimal manual sight-in, auto-calibrated |
Step 1: Bore-Sight Before Your First Live Shot
What Bore-Sighting Does
Bore-sighting aligns your scope's reticle roughly with your crossbow's barrel before you fire a single live bolt, saving time and bolts during the live-fire sight-in process. Many scopes and crossbow packages include a simple bore-sighting method, such as looking down the rail from the rear to visually align the reticle with a target before mounting is finalized.
How to Do It
With the crossbow safely uncocked and unloaded, look through the barrel from the rear (if your design allows this) or use a laser bore-sighting tool if you have one, and adjust the scope's mounting position and initial windage/elevation until the reticle appears roughly centered on a target 20 yards away. This step gets you in the right neighborhood before live-fire adjustments take over.
Using a Laser Bore-Sighting Tool
A laser bore-sighter, inserted into the barrel or bolt channel, projects a visible dot on your target that represents your crossbow's actual point of aim independent of the scope. Adjusting your scope's reticle to align with that projected dot gets you meaningfully closer to a true zero before firing a single live bolt, saving both time and bolts during your first live-fire session. These tools are inexpensive and widely available, and our testing has found them a worthwhile investment for anyone sighting in a new scope regularly.
Skipping Bore-Sighting Isn't a Disaster, Just Less Efficient
If you don't have access to a bore-sighting method, you can still sight in successfully by starting your live-fire process at a closer distance, such as 10 yards, where even a poorly aligned scope will still land bolts on a standard target backstop. Bore-sighting simply saves time and bolts — it isn't a strict requirement for a successful sight-in.
Step 2: Establish Your Baseline Zero at 20 Yards
Why 20 Yards Is the Standard Starting Point
Nearly every multi-reticle crossbow scope, including our reviewed TenPoint RangeMaster 100, calibrates its closest aiming reference at 20 yards. This distance is close enough to make small adjustments easy to read on target, and it becomes the anchor point that the rest of your scope's aiming references are built around.
The Shooting Process
From a stable rest — a bench, sandbag rest, or shooting tripod — fire a group of 3 bolts at a target 20 yards away, aiming at the same point each time. Consistency in your rest and form matters more at this stage than speed, since an inconsistent rest will produce a scattered group that makes accurate adjustment difficult.
Reading and Adjusting Your Group
Measure the distance from your point of aim to the center of your group, then adjust your scope's windage (horizontal) and elevation (vertical) turrets according to the click value stated in your scope's manual, commonly 1/4 MOA or 1/2 MOA per click. Fire another 3-bolt group and repeat the adjustment process until your group centers reliably on your point of aim.
Understanding MOA and Click Values
MOA (Minute of Angle) describes how much a single turret click moves your point of impact at a given distance — roughly one inch per MOA at 100 yards, scaling proportionally at closer distances. A 1/4 MOA click therefore moves your point of impact roughly 1/20th of an inch at 20 yards, which is why fine adjustments at close range can require multiple clicks to produce a visible shift. Understanding this relationship helps you make more confident, larger adjustments rather than creeping toward zero one small click at a time.
How Many Groups to Expect
Most sight-in sessions take 3–5 groups to reach a confirmed zero, assuming your initial bore-sighting or starting point was reasonably close. If you're needing significantly more groups than that without meaningful improvement, stop and check for other issues — a loose scope mount, inconsistent bolt weights, or an unstable rest are common culprits that no amount of turret adjustment will fix.
Step 3: Confirm Each Additional Aiming Reference
Why You Can't Stop at 20 Yards
If your scope includes multiple calibrated aiming points — like the 9-point system on the TenPoint RangeMaster 100 or the TenPoint EVO-X Marksman Elite — establishing zero at 20 yards doesn't automatically confirm the remaining references are accurate for your specific setup. Bolt weight, crossbow speed, and even minor mounting variances can cause the pre-calibrated distance markers to be slightly off from their labeled distance for your exact combination of equipment.
Testing Each Reference Point
Move to each subsequent calibrated distance — commonly 30, 40, 50 yards and beyond depending on your scope — and fire a group using that specific aiming reference. If your group consistently lands above, below, or to one side of your point of aim at a given distance, that reference point isn't accurately calibrated for your setup, which is valuable information before you rely on it in the field.
What to Do If a Reference Point Is Off
Most crossbow scopes don't allow independent adjustment of individual mid-range aiming points — the primary adjustment happens at your baseline zero distance. If a specific reference point consistently misses, note the offset and mentally account for it in the field, or consult your scope's manual for any secondary adjustment options specific to that model.
Step 4: Verify at Your Maximum Intended Hunting Distance
Why the Farthest Distance Matters Most
Errors in calibration become more pronounced at longer distances, so confirming your scope's accuracy at the farthest distance you realistically intend to hunt is critical, even if you don't plan to take routine practice shots that far every session. A scope that reads accurately at 20 and 40 yards can still reveal meaningful drift at 60 or 80 yards that wasn't apparent closer in.
Building Real Confidence, Not Just Theoretical Zero
Our testing methodology treats this final verification step as essential precisely because a scope that's theoretically zeroed on paper doesn't guarantee confidence under actual hunting conditions. Shoot enough groups at your maximum intended distance to feel genuinely confident, not just technically sighted in.
Step 5: Re-Verify After Any Setup Change
What Counts as a Setup Change
Any of the following should trigger a full re-verification of your sight-in, not just a quick single-shot check: switching bolt brands or weight, changing broadheads, re-mounting or adjusting your scope, or any noticeable impact or drop to the crossbow. Even small changes in bolt weight can shift point of impact meaningfully at extended distances.
Building a Pre-Season Routine
Make a full sight-in check part of your annual pre-season routine, even if nothing about your setup has changed since last season. Temperature swings, storage conditions, and simple wear over time can all introduce small shifts worth catching before you're relying on your zero in the field.
Common Mistakes That Undermine Sight-In Accuracy
Shooting From an Unstable Rest
Sighting in from an unsupported, offhand position introduces enough shooter-induced variance to make your adjustments unreliable. Always sight in from the most stable rest available, saving offhand practice for after your scope is confirmed accurate.
Adjusting After a Single Shot
A single shot can be affected by a minor form inconsistency or gust of wind, and adjusting your scope based on one data point risks chasing noise rather than your true point of impact. Always base adjustments on a 3-shot group average, not a single bolt.
Ignoring Bolt-to-Bolt Consistency
If your bolts vary significantly in weight or straightness, your groups will naturally open up regardless of how well your scope is adjusted, making it hard to distinguish scope calibration issues from bolt inconsistency. Using a weight-matched, straightness-verified bolt line during sight-in removes this variable from the equation.
Sighting In With Field Points Instead of Your Hunting Broadhead
Field points and broadheads don't always fly identically, particularly with fixed-blade designs that have more surface area affecting flight than a field point. If you plan to hunt with a broadhead, verify your zero with that actual broadhead at your final confirmation step, not just with field points throughout the entire process — the flight difference, however small, matters most at the longer distances where you'll actually be taking a hunting shot.
Frequently Asked Questions
What distance should I start sighting in my crossbow scope at?
20 yards is the standard starting point for nearly every multi-reticle crossbow scope, since it's the closest calibrated reference on most designs and the foundation the rest of the scope's aiming points are built around.
How many shots should I take before adjusting my scope?
Base adjustments on a 3-shot group average rather than a single shot, since one shot can be affected by minor form inconsistency or wind that doesn't reflect your true point of impact.
Do I need to sight in every aiming reference point on a multi-reticle scope?
Yes, ideally. Zeroing your baseline distance doesn't guarantee the remaining calibrated references are accurate for your specific bolt weight and crossbow speed — verify each one you plan to rely on.
When should I re-check my crossbow's sight-in?
After any bolt or broadhead change, any scope remounting, any noticeable impact to the crossbow, and as a standard part of your annual pre-season routine even if nothing has changed.
Does a digital auto-ranging scope still need to be sighted in?
Yes, though the process is often simpler. Auto-ranging scopes like the Garmin Xero X1i still require an initial calibration to your crossbow's actual chronographed speed, even though they handle distance measurement automatically afterward.
Final Recommendation
Sighting in a crossbow scope is a methodical process, not a one-shot adjustment: bore-sight first, establish a solid baseline zero at 20 yards from a stable rest, verify every additional aiming reference you plan to use, confirm accuracy at your maximum intended hunting distance, and re-verify after any setup change. Skipping steps to save time at the range is the most common reason hunters end up with an unreliable zero exactly when it matters most.
Looking for a scope to sight in for the coming season? Browse our crossbow scopes category hub to compare tested options and find a compatible platform.
Ready to shop? Browse our tested crossbow reviews to find your perfect match.
