A fired cartridge case and a fired bullet.

A fired cartridge case and a fired bullet.

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Forensic comparison of fired cartridge cases: Feature-extraction methods for feature-based calculation of likelihood ratios - ScienceDirect

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Module 09 :: Fired Case Examination

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Machine gun fired cartridge case??

Firearms and toolmarks

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Centerfire ammunition - Wikipedia

Module 09 :: Examination of Unfired Ammunition