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That’s insane. I’ve never seen Coors calculations that high. The highest I’ve ever seen substantiated is 5%, which would put that 398 foot shot at 417. Again, that is typically on the extreme side of the math.
More importantly, who cares? Should we play all games at sea level? What about waiting for the same weather? Humidity? Equal dimensions in all parks?? Baseball (and all sports) is played in a variety of locations with a variety of climates and conditions, why do we discount just this one so vociferously?