Correction for the size of a Baseball (packed)
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How big is 6.220 barrels?
It's about 2,000 times as big as a Baseball (packed)
The size of a Baseball (packed) is about 0.0028428206 barrels.
(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 0.0017446725 barrels and 0.0018941379 barrels. A major league pitcher can throw a fastball at up to 150 kph (91 mph).