The basic physical laws of the conservation of energy show that the bullet weight and velocity determine how much damage is done to the target. Both momentum and energy are observable. A bullet leaving the muzzle of a rifle has kinetic energy, thermal energy, and potential energy. Kinetic because it is moving and spinning, thermal energy when it is hot and potential energy because it can fall to the ground. From calculations made on total bullet energy, kinetic energy makes up the majority of the energy delivered to the target. ...

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