According to the study that was referred to, it really doesn't make much difference what caliber is used so carry whatever is most comfortable, I do. I like my 9mm Shield but I have some really nasty Pow'rBall bullets made by Cor-Bon for my .380s that have both velocity and expansion and won't jam like other hollow points. If you're defending your home, get something bigger than a handgun and then you don't have to worry about this silly debate. If bigger were always better, the FBI wouldn't be going from a .40 back to the 9mm, would they?