- Interior ballistics is the science of a projectile’s signature markings.
- Exterior ballistics is the science of a projectile’s trajectory to impact.
The arc or trajectory of the bullet relative to LOS.
The actual drop of the bullet relative to LOD. A bullet starts dropping away from the LOD the moment it leaves the muzzle.
Line of Departure (LOD)
A straight line out to infinity running down the center of the bore.
Line of Sight (LOS)
A straight line out to infinity as represented by the scope’s reticle.
- The sighting plane formed when the front and rear sights are aligned.