I keep a 20g. double handy with #4 buck. I haven't patterned it, but you really wouldn't want to be within the length of any room in our house. 15 yds isn't an issue. 6 yds would be a long shot.
βIn a time of deceit telling the truth is a revolutionary act.β β George Orwell
It's not over when you lose. It's over when you quit.