Correction for the weight of a US Penny
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How heavy is 320 grains?
It's about eight-and-a-half times as heavy as a US Penny
The weight of a US Penny is about 39 grains.
(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 39 grains. According to a 2010 report by the United States Mint, the cost of manufacturing and distributing a penny is $0.0179 — more than its face-value.