That's nothing. I was testing some new 300gr hardcast 45colt loads thru an old-version Vaquero and thought it would be a good idea to use my 95 GMC truck as a bench rest. Rested my forearms on the driver-side bed rim and took aim at a target, which I had set up on the opposite side of the truck, 20 yards away. The first few cylinders grouped nicely, but I had to rest the front sight deeper down into the rear notch than usual, due to the bullet weight.
The reloads were a success, so I thought why not bounce a lacrosse ball around the field a bit. Threw the ball just in front of my target stand 20 yards away and took the same shooting position and location. First shot made a hell of a clang for hitting hard rubber. That's when I noticed the nice hole thru the upper rim of the passenger side bed wall. Total idiot move on my part. The ball was lower, my sight picture atypical, and I ain't too tall, so the trajectory was predictable if I had given it any thought.
Now that damn truck had frequently given me cause to want to fill it full of lead, so I was sorely tempted to finish the cylinder into the engine block and call it a day. That's when sound judgement suddenly showed up for first time that day, and I decided to walk around the truck and finish shooting from the target-side of the bed. Long story short, the loads were a success, I learned to not shoot across my truck-bed, and my truck learned that I am nobody to be trifled with.
I got a lot of stares, and quite a few questions, regarding that bullet hole. To most I simply replied that I like to keep the bullet holes in my vehicles originating from the inside rather than the outside.