How to Use a Laser Bore Sight Cartridge

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If you’ve ever spent a lot of time and ammo just trying to zero your scope, a laser bore sight cartridge can save you the hassle. It helps align your scope or sights with your barrel before firing a single shot. This tool is easy to use and perfect for dialing in your accuracy at the range or in the field.

What Is a Laser Bore Sight Cartridge?

A laser bore sight cartridge is a tool shaped like a bullet that fits directly into your firearm’s chamber. Once activated, it projects a laser beam down the barrel and onto your target. This beam shows you exactly where your barrel is pointing, helping you adjust your sights or scope without live fire.

Unlike traditional bore sighters that fit in the muzzle, this version is placed in the chamber, which often results in better alignment and ease of use.

Benefits of Using a Laser Bore Sight Cartridge

Quick scope alignment without using up ammo
Fits securely in the chamber for more accurate bore alignment
Safe and dry—no firing necessary during setup
Works indoors or at short range, saving you time at the range

Step-by-Step: How to Use a Laser Bore Sight Cartridge

Here’s a simple guide for using a laser bore sight cartridge effectively:

Step 1: Ensure the Firearm Is Unloaded

Safety first! Always check that your firearm is completely unloaded. Remove any magazines, clear the chamber, and keep the muzzle pointed in a safe direction at all times.

Step 2: Insert the Batteries

Most laser bore sight cartridges come with small watch-style batteries. Open the unit carefully and insert the batteries according to the included instructions. Some models activate automatically when the batteries are installed.

Step 3: Insert the Bore Sight Cartridge into the Chamber

Just like loading a real round, slide the bore sight cartridge into your firearm’s chamber. It should fit snugly. Close the action if necessary to ensure it’s seated properly. Do not pull the trigger or attempt to fire.

Step 4: Aim at a Target

Place a target 15 to 25 yards away, or use a wall with a visible point if you’re working indoors. The laser beam should project a red or green dot where the bore is aiming. Be sure to do this in a well-lit but visible area for optimal contrast.

Step 5: Adjust Your Scope or Sights

Look through your scope or use your iron sights. If the reticle doesn’t line up with the laser dot, use your windage (left/right) and elevation (up/down) adjustments to bring the scope or sights in line with the laser point.

This doesn’t have to be perfect—it gets you “on paper,” meaning close enough to start live fire adjustments without wasting rounds.

Step 6: Remove the Bore Sight

Once you’ve made your adjustments, remove the bore sight cartridge from the chamber. Take out the batteries if you’re done using it, as they can drain over time if left inside.

Step 7: Test at the Range

Now it’s time to head to the range and fine-tune your zero with live ammo. Your first shots should be close to center, needing just minor adjustments to complete the zeroing process.

Tips for Better Results

Use a steady rest or bench to keep your firearm stable during sighting
Choose a visible background for the laser to show clearly
Use in dim lighting if possible—laser dots are easier to see
Double-check scope mounting before using the bore sight
Confirm laser is centered by rotating the bore sight and watching if the dot stays in place

Common Mistakes to Avoid

Forgetting to remove the bore sight before live firing—always double-check!
Assuming laser bore sighting is 100% accurate—it’s a starting point, not the final zero
Using it outdoors in bright sunlight—the laser may not be visible
Using the wrong caliber bore sight—only use cartridges that match your firearm’s chamber

Compatible Firearms

Laser bore sight cartridges are available for nearly every common caliber, including:

.223 / 5.56 NATO
.308 Winchester
9mm
.45 ACP
6.5 Creedmoor
.22 LR (some require special adapters)

Make sure to buy the correct size for your firearm’s specific chamber. Universal bore sighters that fit the muzzle are also available, but cartridge-style models tend to be more accurate and easier to use.

FAQs About Laser Bore Sighting

Is bore sighting the same as zeroing a rifle?

No. Bore sighting aligns your sights with the barrel and gets you close. Zeroing fine-tunes your aim based on actual bullet impact during live fire.

Is laser bore sighting accurate?

It’s accurate enough to get on paper. It helps align your sights to within a few inches, but live firing is needed for precise zeroing.

Can you use a laser bore sight cartridge more than once?

Yes. As long as you store it properly and replace batteries when needed, a laser bore sight cartridge can be used many times.

Are laser bore sights safe?

Yes, but always treat your firearm as loaded. Never point the gun at anything you don’t intend to shoot, and remove the laser before live fire.

Conclusion: Laser Bore Sighting Saves Time and Ammo

Using a laser bore sight cartridge is one of the easiest ways to get your scope or sights aligned quickly. It’s simple, safe, and saves both time and ammo. While it won’t replace actual zeroing at the range, it gives you a big head start and helps make your shooting setup more efficient and accurate.