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First a bullet is loaded into the rear of the barrel, which is a tube connected to the firing pin. Mechanically speaking, the trigger is the catalyst that sets a chain of events off starting with the release of the firing pin which flies forward, striking a tiny explosive charge located in the base of the bullet. That explosion is what ignites the gunpowder inside of the bullet. The gun power is inside the shell casing surrounding the bullet. The pressure change forces the bullet out of the casing and down the barrel. The rifling of the gun on the bullet creates stability in order for the bullet to hit the intended target.

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Ballistics involves the examination of evidence from firearms that may have been used in a crime.
If investigators recover bullets from a crime scene, forensic examiners can test-fire a suspect's gun, then compare the marks on the crime scene bullet to marks on the test-fired bullet.
May cases have been solved due to ballistics.

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Size of a rifle or handgun bore as well as the size of cartridges designed for different bores of guns. (range in size)

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It is the number of lead balls of size that is equal to the approximate diameter of the bore.
That is it takes to weigh one pound.

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Ridges inside of the barrel of the gun to gave stability and project the bullet when fired to the acquired target.

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There is a wide range of different types of shapes a bullet can be. Each having a different purpose to achieve once fired.

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Revolver

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There are many different types of guns that are used by suspects and officers.