Well, Canadaian law being more stringent on house defense firearms, I don't have one by the bedside, otherwise I'd be slapped with unsecure firearms storage.

But, if it were legal and I were to choose one of my current firearms for the task, it would be my Browning ten gauge over/under, loaded with 3 1/2" shells in 000 buck. It's got 30" barrels, so it would keep that grouping nice and tight on an intruders' centre of mass.