Accurately zeroing your .308 rifle is crucial for achieving optimal performance on the range or in the field. Before you even head to the range to fine-tune your scope with live ammunition, boresighting provides a crucial first step. This process allows you to roughly align your scope with the barrel's bore, significantly reducing the time and ammunition needed for final zeroing. This guide will walk you through how to boresight a .308 rifle effectively and safely.
What is Boresighting?
Boresighting is the process of aligning your rifle scope with the barrel's boreline—the imaginary line running through the center of the barrel. It's a preliminary step that gets your scope close to being zeroed, dramatically reducing the number of adjustments needed during live fire. Think of it as a rough alignment before the fine-tuning process. Improper boresighting can lead to wasted ammunition and frustration, so it's crucial to follow the proper procedure.
Tools You'll Need
Before you begin, gather the necessary tools:
- Boresighting tool: These are specifically designed for your caliber (.308 in this case). They come in different forms, including those that use lasers or even a simple alignment tool. Choose a quality boresighting tool that accurately reflects the boreline of your firearm.
- Your .308 rifle: Ensure the rifle is unloaded and the bolt is locked back. Safety is paramount.
- Your mounted scope: The scope should be securely mounted on your rifle before starting the boresighting process.
- Target: A target placed at a reasonable distance (25 yards is a good starting point) will allow you to observe the boresight alignment.
- Eye protection: Always wear eye protection when handling firearms, even during boresighting.
Step-by-Step Boresighting Process
1. Safety First: Always double-check that your firearm is unloaded. Point the rifle in a safe direction at all times.
2. Insert the Boresighting Tool: Carefully insert the boresighting tool into the barrel of your .308 rifle from the muzzle end. Make sure it's seated properly.
3. Secure the Rifle: Use a stable rest, such as a sandbag or a shooting bench, to support your rifle. This ensures consistent alignment and accurate boresighting.
4. Aim and Adjust: Point the rifle at your target. Depending on the type of boresight you're using, you will use the adjustment knobs on the tool itself or on the scope to center the laser or the sighting mechanism on the target.
5. Fine Tuning: Once you have a rough alignment, make minor adjustments to perfectly center the boresight on your target. Remember that this is a preliminary alignment; you'll need further fine-tuning at the range.
6. Remove the Boresighting Tool: Carefully remove the boresighting tool from the barrel.
7. Verify Alignment: Once the tool is removed, briefly look through the scope to confirm that the point of aim still aligns roughly with your target.
Moving to the Range for Final Zeroing
Boresighting only provides a rough alignment. You must proceed to the range for final zeroing using live ammunition. This involves firing multiple shots at different distances and making adjustments to your scope's windage and elevation turrets until you achieve an accurate point of impact. Remember to always follow safe range practices.
Common Mistakes to Avoid
- Not using a quality boresighting tool: Cheap tools can lead to inaccurate results.
- Improperly mounting the scope: A loose or improperly mounted scope will affect boresighting accuracy.
- Not using a stable rest: A shaky rifle will lead to inaccurate results.
- Forgetting eye protection: Always protect your eyes.
- Skipping range zeroing after boresighting: Boresighting is just a starting point; you must complete the process at the range.
Conclusion
Boresighting your .308 rifle is a valuable skill for any shooter. By following these steps carefully, you can save time and ammunition at the range while ensuring your scope is aligned correctly. Remember to prioritize safety and always complete the zeroing process at a safe shooting range using live ammunition.
