I've been considering purchasing a shotgun for home defense and was curious about the penetration power of stray rounds. Assuming that I am not using slugs, is there any risk of harming individuals in other apartments? The distance from my door (presumable point of entry for a perpetrator) to the neighboring apartment is around 3 meters and the length of the entrance hall of my apartment is around 6 meters. The doors and walls seem industry standard for 1990s apartment construction. The reason for my concern (maybe unjustified given the proposed setting) is that I would not want to catch any innocents in the crossfire if I am forced to defend myself.