Just wondering how you guys test your hollow point bullets? I tried taking to plastic jars and waded up 10 shirts and stuffed them in, and the bullets weren't penetrating threw so I thought it was dense enough to stop the bullets (.380,9mm,.357,.45) but for some reason not one bullet mushroomed.... What can I use that would be more like a human body? Thanks. I was using decent ammo to, Corbon and Hornady..