GUN BALLISTICS
Gun ballistics is the work of projectiles from the time of shooting to the time of impact with the target. Gun ballistics is often broken down into the following four categories, which contain detailed information on each category.
Internal Ballistics (sometimes called interior ballistics): the study of the processes originally accelerating the projectile, for example the passage of a bullets through the barrel of a Rifle.
Transition Ballistics (sometimes called intermediate ballistics): the study of the projectile's behavior when it leaves the barrel and the pressure behind the projectile is equalized.
Internal Ballistics (sometimes called exterior Ballistics): The study of passage of the projectile through a medium, Most commonly earths Atmosphere.
Terminal Ballistics - The study of the interaction of a projectile with it's target, whether that be flesh (for a hunting bullet), steel (for an anti-tank round), or even furnace slag (for an industrial slag disruptor).