Try this ( I did), soak some old phonebooks and newpaper. Put them in a cardboard box and shoot at them with #4 birdshot at 15 feet and then at 10 feet. This should simulate actual home defense ranges. You will be suprised at how much penetration you will get. I now use both #4 birdshot and #3 buck in my 20 gauge for home defense in my Mossberg 500.