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658 meters per second is about one-and-seven-tenths times as fast as a Bullet (Handgun).
In other words, it's 1.710 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 0.5850 times that amount.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 383 meters per second. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
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