I maintain there is nothing in the world scarier than hearing the action of a pump gun.
Coach may be quiet, but sometimes a good deterrent is better than having to kill him.
As for load, first one up is 6's, big pattern, won't blow through the outside walls. At anything inside of 30 feet it will blow a bloody rat hole through a person. After that rounds get progressively heavier ending with a slug.
But I really would prefer not to chance a slug leaving my house, entering a neighbors and killing someone.
There is no way that would end well.
A good friend of mine actually was attacked last year by a 17yr old.
So drunk he couldn't even talk, when my friend asked him to leave he cocked a fist and started trying to hit him.
After several warnings and getting hit several times my friend finally had enough. He told him he was getting the shotgun, he'd best be gone now. He grabbed his shotgun, turned, and the kid was right there. Kid grabbed the barrel, my friend pulled the trigger.
Kid screamed ran out, and down a flight of stairs, curled up in a corner and died.
Its taken almost a year to get his stuff back (And yes they took it all, guns, ammo, perscription medicine, everything)
Clear cut case of self defense so no charges filed. But my friend will have to worry about a civil suit for some time yet.
Pulling that trigger is the worst last option. And should only be done if you have no other options.