if in site you could get the less than leathal rounds, i know thats not gonna end the guys career, but trust me they will do everything but kill the guy unless you place rite. they have the been bag, rubber bullet and rubber buck shot. the rubber bullet at close range will break bones no problem.
other than these you could always use a bird load out to 15 yards or so they don't open much and will put a big whole in them, but the residual pellets should stop in the walls, dry wall, studs, etc.
i do agree that slug or buck shot is the top way to go when there is no collateral damage of life, i have lots of the 00 rem loads for my shotgun, but don't hope to shoot in a house or apt.