I had a Remington Core-lokt out of a 18'' barreled Remington 600 pass through a white tail.
Problem isn't so much passing through, its when you miss and it starts going through walls.
I know you said you don't like AR's because of the small bullet, but your asking to justify your purchase when there is really no justifying it. A 5.56 is more suitable for your needs and will perform better for home defense, and that small bullet will stop someone or something in its tracks. If you want a M1A or FAL by all means buy one, but I would be hard pressed to choose one of those over my AR-15 for home defense.