What happens next?

How to calculate the distance traveled by an object using vector kinematics
Determine the angle which the bullet is fired, relative to the ground.
This can be done using a simple mathematical compass.
Determine the initial (starting) velocity of the bullet as soon as it leaves the barrel of the gun.
This information can usually be found on the gun's package or the manufacturer's website. The initial velocity of the projectile varies, depending on the gun model and ammunition type.