Measure centerline of optic to center line of bore.
If choosing a 200-yd first zero (200 M), your bullet should impact above a 100-yd bullseye (100 M). If choosing a 100-yd first zero (100 M), your bullet should impact dead center on 100-yd bullseye (100 M).
When sighting in, if you choose a target range less than your first zero range, your point of impact will be higher than the bullseye.
Muzzle velocity has a heavy bearing on creating accurate down range data. If you can not chronograph your MV, subtract 50 FPS per inch for barrels shorter than 24" and key in the the lower muzzle velocity. For metric, subtract 6 m/s for each cm of barrel length less than 61 cm.
All bullets and factory loads have a published G1 Ballistic Coefficient. These can be found at the manufacturer's website, on the ammo box or in the Speer Manual. All Federal Premium and Fusion bullets will auto-fill the G1 ballistic coefficient. The Weaver Ballistics Calculator factors in for different bullet shapes, where the standard shape is a spitzer type boat tail.

Fine tune your atmospheric inputs to more closely match your anticipated shooting conditions by overriding the four default selections.

The Weaver Windage Reticle allows for more precise long range accuracy. Calculated wind speed values will align with any chosen wind speed.
International standard atmosphere model provides a consistent reference point for air pressure at elevation. When selecting the elevation at your intended shooting location, the air pressure will auto-fill to the global standard.

Step 1:
Mount and bore sight your Grand Slam Riflescope, head to the shooting range.

Step 2:
Remove the Ballistic Turret (elevation) Cap and zero your rifle at your desired starting target distance (meters or yards). You should do this entirely with the cap off, using a coin or screwdriver to turn the brass dial for elevation.

Note: If choosing a 200-yd first zero (200 M), your bullet should impact above a 100-yd bullseye (100 M). If choosing a 100-yd first zero (100 M), your bullet should impact dead center on 100-yd bullseye (100 M).

Step 3:
Without rotating the turret, slide the MultiStop carrier onto the brass splines, aligning the hard stop immediately to the right of the white arrow. Test the hard stop by turning the MultiStop carrier clockwise; the turret should not be able to rotate clockwise (down travel). This hard stop feature allows you to quickly return to your first zero without counting turns.

Step 4:
Referencing your ballistic printout page, load the colored pins into the MultiStop carrier, aligning to the slots with MOA markings. Pay special attention to the order of the colors and rotational direction, counterclockwise rotation is for further, "up" distances. Replace the cap and tighten the turret cap screw.

Step 5:
Shoot at each MultiStop range to confirm the accuracy of each stop. Only adjust the colored pins locations if the estimated MOA for the stop does not result in a bullseye at that range.

Note: While bullet ballistics are generally predictable, no two guns will shoot the same ammo identically. The recommended setup is to first chronograph your muzzle velocity for the ballistic calculator, and shoot at each turret stop distance for final confirmation. A 3-round group with a maximum vertical spread of 1.5" (3.8 cm) is a minimum recommended standard for long range accuracy. Sub-MOA groups at 100-yds (100 M) will show better groups at longer range.

Step 6:
If you are satisfied with your range results, cutout and insert the FastFire Ballistic Disk in the lens cover, facing you with the lens cover open.

*Distances must be in 50 yard increments. Choose any order and colors (White must always be first pin). Any color not wanted enter '0'.