Look again at the bullet holes made by the rounds as seen from outside the vehicle.

They are oblong and not perfectly round.

This is because the bullet is actually deflected by the windshield.

The angle of the windshield causes the top part of the bullet to impact the glass before the bottom part, and effects the trajectory of the round enough to move the impact of the bullet several inches.

Look again at the target photos: Notice anything interesting?

The heavier the bullet, the less deflection you see.

My P220 shooting the 230 grain FMJ deflected the least, while the 9mm ball round deflected the most.

Different vehicles have their windshields at different angles so not all deflections will be exactly the same as on this Buick.

The more severe the angle of the windshield, the more deflection you are likely to see.

If you are ever forced to fire through the windshield of a vehicle, generally you should aim a bit lower than your intended point of impact to compensate for the deflection.

Notice how close the target is to the vehicle.

A target farther back would be completely missed by these single shots.

But there is a way to compensate for that.

Since the deflection only happens when firing through the windshield glass, firing repeatedly from the same hole will remove the glass from the way of following rounds, meaning that you can hit your point of aim.

Lessons learned:
Shooting through the windshield of a vehicle is not the ideal way to engage a threat while you are in a vehicle.

The only time one would employ this tactic is if faced with a threat you cannot move away from. A car is a much better weapon than a handgun and should be used if at all possible to evade the threat, or to just flat run the threat over.

But if your vehicle is immobilized or blocked in, shooting through the windshield might be the only means of defense that you have.

It should be noted that armored vehicle glass works 2 ways, so do not try to shoot through armored vehicle glass.