Madlink-Just my opinion, but what about replacing that blank with a non-lethal round? I just think a blank is like a bluff, and if the situation is serious enough to grab a shotgun I don't want to try to bluff.
OP- The first thing I would do is look into the construction of the building. Brick? Firewall? Which walls are they?
You could have a defensive plan where your lines of fire are at those walls.
Also, I think a shotgun in addition to being more intimidating, would give you more load options to reduce overpenetration.
Last, what ranges are we talking? The farthest I can shoot in my house realistically is 23'. My load choice for a shotgun would be different than if my distance was (like my parents house) 35' or (in my friends appartment) 12 to 15'.
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