Used to kill Geese with #4 Bismuth Non-Tox Shot in 12 Gauge very regularly. Nothing really exotic about that. Take the Bullet Shield/Pillow of your choice out and shoot it with a Cardboard backing on it. I'll bet there will be holes in the CardBoard! Federal EFMJ should sail right thru it along with some of the more modern hollow points. This was probably true of many first generation Hollowpoints, but times and ammo have changed. You cannot count on what kind of ammunition your assailant(s) may be using. They may just use whatever el-cheapo FMJ they can get their hands on!
Try it and let us know how it works. Please post pics!
Beware the Gunshop and Range Commandos! Sometimes they do know what they are talking about, and then.................. :