Ballistics is the science or study of projectiles and the way they move through the air. In most cases the term, ballistics, refers to bullets and firearms.
This is by no means a comprehensive list of all of my ideas, nor does it fully describe them in the amount of detail I have thought of them in.
9MM Anti-Material ammunition
I like to call the ammo type R9MM because the shape of the bullet and chemicals inside create somewhat of a rocket thruster making the bullet itself accelerate even after it has left the barrel of the gun.
The Warning Shot
The Warning Shot is a bomb that you can drop on an enemy that, when it detonates, burns hotter and brighter than a nuclear bomb to warn that specific enemy that you are planning on dropping a much bigger bomb, invading them or other means of mass destruction. this way the leaders of said enemy have time to evacuate civilians, or prepare themselves, thereby minimalizes civilian casualties.
Laser Range-Finder scope
This devices either attaches to your gun or is built into it. It uses a variety of different measuring devices using a multitude of different lasers and sensors to calculate the exact point that your bullet will hit from any range. this will be especially useful for snipers as it eliminates the need for a spotter, and even a scope.
Anti-Tank Throwing Spear
This spear is a long projectile that can be thrown by hand that uses a order of chained explosions to launch explosives at the target capable of making even the best modern tanks irreparably damaged. it is a cost effective, highly efficient way to take out the most expensive and most deadly war vehicles.