Ensure the rifle is unloaded and pointed in a safe direction
Use the correct ammunition for the rifle
Mount the optic or use the iron sights securely
Set up a stable shooting rest or bench
Start at a short distance, such as 25 yards
Fire a controlled group of shots at the target
Observe the point of impact relative to the point of aim
Adjust the sights or optic in the needed direction
Fire another group to confirm the adjustment
Repeat until the group is centered where intended
Move to the desired zero distance, such as 100 yards
Fire a final group and make fine adjustments
Confirm the zero with several consistent groups
Record the final sight settings or zero distance
Verify the zero periodically and after transport or changes to the rifle