Begin by securing the firearm in a stable position. This will cut any movement during the boresighting process. Using a gun vise, rest, or any other secure platform is perfect.
✔ REMOVE THE BOLT OR ACTION
For firearms that allow it, remove the bolt or action to gain a clear line of sight through the bore from the back end. This will enable you to see the target through the bore.
✔ ALIGN THE SIGHTS/OPTICS
Look through the bore from the back end and align it with the target or point of impact. Ensure that the firearm remains as steady as possible during this step. Take your time to align the bore with the desired point of impact.
After making initial adjustments, fire a live round and verify. If necessary, make further adjustments to fine-tune the alignment until you are satisfied.