My house is rather small. Longest distance is probably no more than 5 yards. At that range almost anything out of a 12 GA. is devastating to a human threat.

No, I'm not saying I use the lightest #9 trap load on the market... but yes, at 5 yds that choice is most certainly lethal.

I have 000 BK right now but wouldn't feel defenseless with 00, 0, 4 BK, #6 turkey or whatever.

Any difference between the loads is overshadowed by how much (or little) training and proficiency we have with our guns anyway.