Myth Blaster: Door Penetration of Certain Ammo

So much bickering about what is best for "home defense" when it comes to ammunition, as well as types of firearms. One person insisted that having a .40 caliber pistol was better than a 9mm or .38 caliber because it could penetrate his steel-clad front door. During the argument I pointed out the danger of shooting through a door when one does not know what is going on the other side and reminded him that there could be return fire.

The following two videos are visual demonstrations of ammo penetration - and the .22 long rifle can penetrate a steel-clad door at 20 feet, contrary to the home defense "experts" as the second video demonstrates.