herzalot
iMTB Hooligan
Buckshot (anything heavier than #4) will penetrate four sheets of drywall at close range... But will not penetrate a 5th. Birdshot at close range will penetrate two sheets of drywall (one wall), and will not penetrate the paper of a third sheet at close range. Shot through a wall, even at close range, birdshot will probably not break human skin.
Your house sounds like a mess...