A bit off topic...
For home defense, I've considered the option of .45 cal carbine vs shotgun and lean towards the carbine, though something of an "apples & fruit salad" comparo...
1. More rounds at the ready
2. Smaller, easier to maneuver..
3. Less recoil... shouldn't intimidate the wife
4. Likely won't leave the home shooter deaf
5. More effective range... something like 100-125 yards. Shotgun would be good at 20 feet, but maybe not at 50 yards.
When the breakdown comes, you might want to engage aggressors out in the yard besides when they break the door down.