How to Zero Your Rifle Scope: Complete Sighting-In Guide

A properly zeroed scope is essential for accurate shooting. Whether you just mounted a new optic or need to confirm zero, this guide walks you through the process.

What Does 'Zero' Mean?

Zeroing aligns your scope's point of aim with your rifle's point of impact at a specific distance. When zeroed at 100 yards, for example, where you aim is where the bullet hits at that distance.

Choosing Your Zero Distance

• 25 yards: Good starting point, close to 100-yard zero for many calibers
• 50 yards: Common for .22LR and shorter-range shooting
• 100 yards: Standard for most centerfire rifles
• 200 yards: Good for flatter-shooting calibers and longer-range use

Step 1: Bore Sighting

Before shooting, get roughly on paper:

Laser Bore Sighter Method

1. Insert laser bore sighter into chamber or muzzle
2. Aim at target 25 yards away
3. Adjust scope until reticle aligns with laser dot

Visual Bore Sighting (Bolt Actions)

1. Remove bolt and secure rifle
2. Look through barrel at target 25 yards away
3. Center target in barrel
4. Without moving rifle, adjust scope to same point

Step 2: Fire a Group

1. Set up a stable shooting position (bench rest ideal)
2. Use sandbags or a rifle rest
3. Fire 3 shots at the target, aiming at the same point
4. Let barrel cool between shots for best accuracy

Step 3: Measure and Adjust

Find the center of your 3-shot group. Measure how far it is from your aim point:

• Measure in inches at your zero distance
• Most scopes adjust in 1/4 MOA clicks
• 1 MOA = approximately 1 inch at 100 yards
• So 1 click = 1/4 inch at 100 yards (1/8 inch at 50 yards)

Making Adjustments

Scope turrets are labeled:

• Up/Down: Elevation adjustment
• Left/Right: Windage adjustment

Move adjustments in the direction you want the impact to move. If shooting low and left, adjust Up and Right.

Step 4: Confirm Zero

1. Fire another 3-shot group
2. Verify group is centered on aim point
3. Make fine adjustments if needed
4. Fire final confirmation group

Pro Tips

• Use consistent ammunition for zeroing
• Shoot from the most stable position possible
• Let the barrel cool between groups
• Record your zero settings
• Confirm zero periodically and after travel
• Zero with the same shooting position you'll use in the field

Troubleshooting

• Can't get on paper: Start closer (10-15 yards) or re-bore sight
• Groups won't tighten: Check scope mount torque, try different ammo
• Zero shifts: Check all mounting screws, may indicate scope issue

Need Help?

Many shooting ranges offer scope mounting and zeroing services. Gun stores often have bore sighting equipment and can help with initial setup.