One of the things we did this week at the Crimson Trace / Ruger / Safarilant / Leupold / DoubleTap Gunsite event was shooting through intermediate barriers. Part of that was shooting through a windshield to see how much a bullet will deflect (change direction) when it moves through that rather tough piece of engineering. But as we found out, the answer was “not a whole lot.”
We were using DoubleTap’s Bonded Defense series of handgun rounds, and every single one had a very minimal deflection when shot head-on into the car’s windshield. In fact, any deflection we saw could be attributed to shooter error. There was however some considerable loss in energy going through the barrier, with only the 45 ACP and 5.56 ammunition zipping through the rest of the car as well as the dummy — the others we recovered in the rear windshield.
Moral of the story: use 45 ACP if you’re shooting through a windshield.