Weapon Blog has posted some excellent articles lately on terminal ballistics. Really, they are videos of people shooting things. Is there any other way to conduct terminal ballistics modeling? In terminal ballistics, empirical data rules over analytical solutions.
In the first video, the shooter fires multiple calibers at a pine tree to determine which ones will penetrate.
In the second video, the shooter fires 5.56, 9mm, and 22LR through multiple layers of drywall.