I stuffed up the math a bit. When combining errors you: square them, add them, and then take the square root.
Now with a rifle accuracy of 0.30mil (~1moa) and a wind error of 0.32mil (±3km/h, ±0.16mil) at 450m. The combined error is √(0.30² + 0.32²) = 0.44mil. 450m x 0.44mil = 198mm.
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