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678 yards per minute is about one-ninetieth as fast as a Bullet (Rifle)
In other words, it's 0.0113 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 88.50 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 60,000 yards per minute. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
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