Choosing a home defense firearm is important. What about defensive ammo? Look at what Rich Graham shows us regarding residential wall penetration from a standard modern day musket:
If you plan to use a rifle for home defense purposes it's very important that you spend the time and money to acquire frangible ammo. If you plan to use a handgun be certain you have proper defensive ammo for home carry.
Remember: once you press the bang switch you own that projectile until it stops moving.