This is the Hypothetical question scenario: I was thinking of using either a 5.56MM or a 7.62x39MM carbine for home defense and I am concerned about over pen in home walls. I don't wanna reach out & touch the neighbors so I am looking for some good (IE; reliable and reasonably accurate for its intended purpose) fragmenting or prefragmented ammo to solve this concern. I am really hoping to get AMMO SUGGESTIONS, not advice to get a (shoulder cant take the recoil anyway) shotgun. All AMMO SUGGESTIONS or related info will be greatly appreciated. Thank you in advance.