My MLs are for building, reenacting, competition and hunting because I love the look, tradition and challenge that they offer. They are my hobby, but I know where to draw the line between sentiment and combat effective.
When it comes to defending self, family and others under my care, I want the absolute best in equipment and tactics. As Paul suggested earlier, a legal but short barreled shotgun at a specific choke/challenge point is the first choice. It should be loaded with a shell that will not over-penetrate and endanger others. I disagree only with his mention of the double and opt for a pump for a variety of tactical and personal reasons.
A high capacity auto (with a caliber beginning with .4something or other) is next. Mine are mostly combat Tupperware in a variety of calibers.
Cover, lights, medical, communications and requests for assistance are also major factors involved in the survival plan.
MLs are not even on the list as their day is done in matters of mortal combat in my opinion.
CS