I had heard of the ‘Glaser bullets’ before, and just visited the linked site.
Looks like tiny, tiny shot pellets incased in copper with a plastic tip. Is that an accurate description?
Like everyone has said, shoot what you are comfortable with. I have no neighbors, so over penetration is of little concern. I also need something that can deal with wildlife if needed. Black Bears are pretty common around here. And they do break into houses.
My choice is a Ruger .357. Plenty for two legged intruders, and enough for smaller bears. The .357 is reasonably easy to concel and have at the ready, whereas a shotgun is a little tougher to hide and have ready.
I don’t completely agree that a rifle or shotgun is two long for defense in a house. The key here is defense. If someone broke in, at least in my circumstance, I’m almost sure to know about it. We have two very alert dogs. I’m quite sure that I could defend the bedroom with a rifle or standard shotgun. Or at the very least, I doubt anyone would be crazy enough to try to get to our bedroom if they knew I was awake, and armed with anything. It would be suicide.
For others, especially with kids, I understand that it would be important to look for an intruder, instead of having them come to your defended position. I have thought about this, and think anyone that has guns needs to. While nothing ever happens like you think it will, it’s important to consider possible options before hand.
If an intruder is in the bedroom, IMHO, it’s already too late.
Waiting to rack a shotgun so the intruder can hear it is completely counter productive. If you have made the decision to use a gun for protection against an intruder, you better make damn well sure it’s chambered before you face them. And as others have said. “I’m armed, leave the house”. Is all you should say, and all the intruder needs to know.