I was thinking, originally, of just getting 00 buck for home defense loads. I might just use the #4 shot up at a range and refill with 00 buck actually. Thinking about it a bit more, chances are the shots will be down the stairs (from the 2nd floor to the first) so any 'stray shots' will either hit the front door, or ground outside. I might alternate the #4 and 00 in the shotgun.
As for the .45 ACP rounds... I'm more confident with the pistol. I won't 'spray and pray' with it. I also figured that by the time the .45 rounds (230g hollow points) went through the inside wall, insulation, and hit the outside wall, they would have spent enough energy to not go much further. I don't have any actual data on that, so I could be off-base. Does sound like something that we should test though. Build up some mock walls and use different rounds on them at different ranges to see the effects. Group shoot?? Hopefully we can do it in NH, so I can take part.