A fired bullet and cartridge case

A fired bullet with rifling impressions from the barrel of a gun (left). A fired cartridge case and fired bullet (right). Experts can often identify the weapon used based on rifling impressions on the bullet, or breech face and firing pin impressions in the primer at the base of the cartridge case.

5,977 Shot Cartridge Case Images, Stock Photos, 3D objects, & Vectors

Brief history of forensic firearms identification-fitchetts guns (2)-converted - Bev Fitchett's Guns - Studocu

Shelling Out Evidence: NIST Ballistic Standard Helps Tie Guns to Criminals

Brief History of Forensic Firearms Identification - Forensic's blog

Cartridge Case Identification - Scena Criminis

Cartridge (firearms) - Wikipedia

Solving Issues with Brass Casings

How do coroner or forensic people know which bullet hit someone first, second, or third when someone has been shot multiple times? - Quora

ELEY No 12 GAS TIGHT - General Ammunition Discussion - International Ammunition Association Web Forum

Ammunition 101: Understanding the Basics of a Firearm Cartridge [or Bullet] - Dark Earth Tactical

ASU study sheds new light on inconclusive gun evidence

Once fired, is a bullet able to be traced back to the gun or at least the make/model it was fired from? - Quora