Para Bellum, . . . I'm going to play the other card here for a minute.
I understand we are talking "Home Defense", . . . not Tikrit or Bagdhad.
In a HD scenario the shotgun is a far better weapon, especially if you have trained to reload between firings. In the long run a good semi auto shotty will hold 7 or 8 rounds, . . . a stock sleeve can hold another 6 or 8 and a forearm sleeve another 6 or 8.
We are talking about doing in a determined bg or 2, . . . at most 3, . . . or holding out till the cavalry (LEO's) arrive. This is not Pork Chop Hill or Guadalcanal.
Staying with the HD idea, . . . virtually any LEO will tell you that anyone who would attempt to clear a modern house alone, . . . is like the guy playing his own lawyer, . . . he's got a fool for a client. Don't do it, . . . LEO's get paid to do it, . . . can travel in pairs, . . . and have far more equipment and training than we will ever get.
Play the coward, . . . hunker down in the bedroom, . . . make him/them come to you, . . . a 12ga load of 00 buck in his face will definitely spoil his whole day, . . . and you got 18 more rounds waiting for any follow up bg.
Even if the turkey is wearing super threat body armor, . . . it don't cover the face. Slugs will also hurt him bad with or without armor, . . . while the .223 can be absorbed and he can still come get you.
Oh, . . . yeah, . . . that is my plan and you can use it without any royalties.
May God bless,
Dwight