>>507515649
9mm would go through 2 or more houses if it didn't hit a stud. So would 5.56 or .45 or just about anything other than bird shot from a shot gun.
https://www.theboxotruth.com/threads/the-box-o-truth-1-the-original-box-o-truth.278/
https://www.theboxotruth.com/threads/the-box-o-truth-2-the-box-speaks-again.280/
https://www.theboxotruth.com/threads/the-box-o-truth-12-insulated-walls.308/#post-982