Laser boresighters have revolutionized firearm zeroing, offering a faster and safer alternative to traditional methods. But how accurate are they, really? This isn't a simple yes or no answer. The accuracy of a laser boresighter depends on several factors, and understanding these nuances is crucial for anyone considering using one.
Understanding the Limitations: Why "Perfect" Accuracy is Unrealistic
Before diving into specifics, it's important to set expectations. A laser boresighter isn't a substitute for proper zeroing on a range. It's a tool designed to get you close, significantly reducing the time and ammunition needed for final adjustments. Several factors contribute to the inherent limitations in accuracy:
1. Laser Alignment: The Foundation of Accuracy
The accuracy hinges on how precisely the laser is aligned with the bore's axis. Slight misalignments, even fractions of a degree, can result in noticeable point of impact (POI) shifts at longer ranges. Manufacturing tolerances, as well as the care taken during insertion and use, play a critical role here.
2. Environmental Factors: Heat and Vibration
Temperature fluctuations can affect the laser's output and trajectory. Similarly, vibrations during use, especially in less stable boresighters, can introduce inaccuracies.
3. Bore Condition: Internal Rifling and Obstructions
The condition of the firearm's bore directly impacts accuracy. A damaged or fouled bore can cause the laser to deviate from its intended path.
4. Type of Laser Bore Sighter: Quality Matters
The quality of the boresighter itself is paramount. Inexpensive models often lack the precision manufacturing and robust construction of higher-end alternatives. Look for boresighters with features like adjustable brightness and precise alignment mechanisms.
Accuracy Expectations: How Close is "Close Enough"?
While precise figures are difficult to give without specifying the boresighter model, firearm, and environmental conditions, a well-executed boresighting with a quality instrument should get you within a few inches at 25 yards. This significantly reduces the time spent on the range, requiring only minor adjustments to achieve a perfect zero.
Remember, the goal isn't perfect accuracy at this stage; it's a significant reduction in the time spent adjusting your scope or sights on the range. Consider this a "first approximation," a very good starting point for your zeroing process.
Improving Accuracy with Proper Technique
Several steps can enhance the accuracy of your boresighting procedure:
- Clean Barrel: Ensure the firearm's barrel is clean and free from obstructions.
- Secure Mounting: Properly and securely mount the boresighter to prevent movement or misalignment.
- Stable Environment: Conduct the boresighting process in a stable, temperature-controlled environment.
- Multiple Measurements: Take multiple measurements and average the results to minimize errors.
- Use a Quality Bore Sighter: Invest in a reputable brand known for its precision and durability.
Conclusion: A Valuable Tool, Not a Perfect Solution
A laser boresighter is a valuable tool for anyone who wants to streamline the zeroing process. While it won't achieve perfect accuracy on its own, it significantly improves efficiency and reduces the need for extensive range time and ammunition consumption. Understanding its limitations and employing proper techniques can maximize its effectiveness and get you closer to your target than ever before. Remember always to prioritize safety when handling firearms and to use them responsibly.
