But we were amazed that the round penetrated 10 sheets of drywall!

This is the hole in sheet #10.

And this is where it bounced of sheet #11.

Now, we had to ask, "Why did it penetrate #10 and then say, 'That's it, I quit', on #11?

I don't know.

Here's the wadding in front of sheet #11.

Well, time for the Waterbox O' Truth.

How many jugs (and inches) of water will this round penetrate at 15 feet?

Only one way to find out.