Use in Ballistics
The sectional density of a projectile can be employed in two area of ballistics. Within external ballistics, when the sectional density of a projectile is divided by its form factor it yields the projectile's ballistic coefficient.
Within terminal ballistics, the sectional density of a projectile is one of the determining factors for projectile penetration. The interaction between projectile (fragments) and target media is however a complex subject. A study regarding hunting bullets shows that besides sectional density several other parameters determine bullet penetration.
Only if all other factors are equal, the projectile with the greatest amount of sectional density will penetrate the deepest.
Read more about this topic: Sectional Density