: As a bullet passes through the barrel, these lands and grooves leave unique microscopic "striations" (scratches) on the bullet. These markings act as a ballistic fingerprint , allowing forensic experts to identify the specific firearm used by comparing crime scene evidence to test-fired bullets under a comparison microscope .
In the context of firearms and ballistics, a central feature is , which refers to the spiral grooves cut into the internal surface of a firearm's barrel. Key Aspects of Rifling Firearms and Ballistics
: This is the distance the rifling takes to complete one full revolution (e.g., 1 turn in 7 inches). It is a critical "constant" in ballistics that must match the weight and length of the bullet for optimal stability. Ep. 15 | Ballistics for Beginners : As a bullet passes through the barrel,