Sighting in your rifle scope for 100 yards is one of the most essential steps in achieving consistent and accurate shooting. Whether you're a hunter, a target shooter, or just getting started, properly zeroing your scope ensures that your point of impact matches your point of aim.

Here’s a step-by-step guide to help you sight in your rifle scope at 100 yards with precision and confidence.

Step 1: Prepare the Right Gear

Before you begin, make sure you have the following:

  • A rifle with a mounted scope (secure and properly torqued)

  • Quality ammunition (use the same type you plan to shoot regularly)

  • A stable shooting rest or sandbags

  • A target with clear markings (ideally with 1-inch grids)

  • A bore sighter (optional but helpful)

  • Tools for scope adjustments (usually a flathead screwdriver or turret knobs)

Step 2: Start at 25 Yards (Optional but Recommended)

Begin by sighting in at 25 yards to ensure your shots are on paper.

  1. Set your target at 25 yards.

  2. Fire 1–3 rounds while aiming at the center.

  3. Adjust the windage (left/right) and elevation (up/down) turrets on your scope until your shots hit the bullseye.

  4. Once you're hitting the center consistently, you’re ready to move to 100 yards.

Tip: Use the reticle markings (MOA or MRAD) to estimate how many clicks to move. For example, 1 MOA = 1 inch at 100 yards, so 4 clicks on a 1/4 MOA scope = 1 inch of adjustment.

Step 3: Move to 100 Yards and Shoot a Group

  1. Set up your target at exactly 100 yards.

  2. Get into a stable shooting position and fire a 3- to 5-shot group aiming at the center.

  3. Evaluate the group pattern — don’t chase individual holes. Use the center of the group as your point of impact.

Step 4: Make Scope Adjustments

Now it’s time to move your point of impact to match your point of aim.

  • If your group is 3 inches low and 2 inches right, you’ll need to move the elevation up 3 MOA and windage left 2 MOA.

  • Most scopes adjust in 1/4 MOA per click, so:

    • 3 inches = 12 clicks up

    • 2 inches = 8 clicks left

Make the adjustments and fire another group to verify.

Step 5: Fine-Tune and Confirm Zero

Repeat the process of adjusting and shooting groups until your shots consistently hit the center of the target. When satisfied:

  • Fire a final confirmation group

  • Mark your zero on the turret (if your scope allows)

  • Note environmental conditions (wind, temperature) that might affect your point of impact

Bonus Tips for Better Zeroing

  • Use the same ammo you’ll be shooting in the field or competition

  • Shoot in calm weather to avoid wind drift

  • Allow your barrel to cool between groups to prevent heat distortion

  • Clean your rifle before zeroing if it hasn’t been used in a while

  • Use a rear sandbag or squeeze bag for better stability

Final Thoughts

Sighting in a rifle scope for 100 yards doesn’t have to be complicated — but it does require patience, consistency, and a methodical approach. A properly zeroed scope not only improves your accuracy but also boosts your confidence every time you pull the trigger.

Once you're sighted in, maintain your rifle and practice regularly to stay sharp. And remember, small adjustments can lead to big improvements downrange.