Originally Posted by Specialized Dynamics
I think you should perform another test. Shoot the ceiling tile without anything in front of it. I be you will only have a hole there. Once the bullet goes through the jug of water it probably loses enough energy/velocity that it becomes unstable.
I am surprised that the water jug didn't blow apart though. Did you have a cap on it or was it open?
I have shot the ceiling tile before using it as target backing and it showed a nice hole.
The jug was capped and full to within an inch.
Still have no idea why the jug didn't open up.