I must respectfully call "bs" on those of you who say there is a duty to retreat in your own home, in Massachusetts, New Jersey, or any other state. Quote a statute if you can find it...you won't. Call a lawyer if you know one.
I have been a criminal defense lawyer for 30+ years. In your home, you are not required to retreat from a burglar or home invader. Period. Out in public is a different question, the statutes vary from state to state. In Alabama, for instance, you have a right to "stand your ground", same as in Texas. Other places you may have to think before you shoot.
I have read hundreds of transcripts of trials involving all types of violent crimes, including home invasions. From my experience, home invasions are not the work of a single guy; usually 2 or more thugs are coming in. (other than my neighbor, who was beaten to death with a hammer by a single burglar)The usual gun for a thug is a .380, with 9's and 40's next. Very few 22's. Thugs will blow each other away with 45's. That's a one-shot gun for sure. (in one case, the .45 "severed" the thigh bone - LEO testified that it was "quite a mess"). I digress.
The need for home defense seems to arise in an instant, without warning. You hear a crashing window or door. You're asleep, after midnight. If you had a few beers the night before, you're not sharp. Even if you didn't, you're not. You wake up, disoriented. You better have a nightstand gun. Slide the drawer open, grab the gun. You're armed. For me that would be a .38 revolver. A snub. Not too big or small. Ready to fire. (I have a 686-4 4", but a snub is next)
What you do next -- well there's no rule. Personally, I would think I'd fire a warning shot before I saw a burglar face to face, screaming GTF out. Then again, I don't know how I would react.
This business about lawsuits against the homeowner by the family of a dead or injured thug? BS flag #2 (respectfully).