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Message: <blockquote data-quote="Umbran" data-source="post: 3650913" data-attributes="member: 177">Your typical 9mm round has a mass of about 8 grams.  From a modern weapon, it may have a muzzle velocity of, oh, 1000 meters per second.  That makes for a total momentum of 8 kgm/s.  The arquebus round you mentioned would have roughly 1.5 times as much momentum, and the crossbow bolt about 60% as much momentum as the bullet.Your average man has a mass of about 70 kilograms.  If all the bullet's momentum is transferred to the body, that body will end up moving at roughly 0.11 meters per second.  That is about 4 inches per second.  Note that the energy goes like the velocity squared.  So, while it is lighter, the bullet has about twice the kinetic energy of the arquebus round, and thirty times the energy of the crossbow bolt.</blockquote>