Nowhere inside my home presents a longer range than about 30 feet. I live in a city, residential area with close neighbors. My 870 Remington is kept loaded with 2-3/4" loads of BB-shot (90-or so .17 caliber lead balls). Inside the house I doubt that any intruder would notice the difference between 1-1/4 oz. of BB-shot and a rifled slug, but I also doubt that any wall would be penetrated with enough remaining force to cause serious injury.

Your method may vary.