Correction for the weight of an American Football
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How heavy is 320 grains?
It's about one-twentieth as heavy as an American Football
The weight of an American Football is about 6,343.750 grains.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 6,125 grains and 6,562.50 grains. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.