A scope may include an adjustment dial, which may be moved among a plurality of positions to configure the scope to compensate for projectile drops. The adjustment dial may be labeled with dial-calibration data, which may include one or more distance indicators and/or one or more windage hold-off indicators. The scope may be attached to a gun and the dial-calibration data may be at least partially generated using ballistics performance data based on shots fired by the gun. The dial-calibration data may be at least partially generated using shooting conditions. An electronic device may include a derived distance calculation module, which may be configured to use a distance to a target and actual shooting conditions to calculate a derived distance. The derived distance may be used in connection with an adjustment dial labeled with dial-calibration data at least partially generated using shooting conditions different from the actual shooting conditions.