Shooting from inside a car??? Ouch!
I went to the range a few years back to sight in my mini-14. It was raining, wet and muddy, and I forgot my ground cloth. Now I have a pick-up with a cap, so I set up from the bed of my truck. Never thought to open the windows in the cap, but I did put on extra ear protection. Wasn't enough. The concussion felt like Mike Tyson had hit me from all directions at once, and my ears rang into the next day. Trust me, I won't do THAT ever again!