There would be the intruder between you and the wall. I’m not talking shooting at a blank drywall. The #6 will not go through the guy and into the drywall x2 into the next apartment. Close in, the pattern diameter would be less than 6 inches.
It is my sincere hope that you never find out what your hit rate is in a close quarters gun fight.
Use a 223 with this ammo:
https://frangiblebullets.com/223-Remington-45gr.-Frangible-by-L-Tech-Box-of-20.html