The logic that I was trained to use in that type of situation was simple, you are entering into a gun battle without knowledge how many opponents you face and how well they are armed or how determined they are. With that in mind the first rule is to never offer your opponent an advantage over you which is exactly what charging a pump action shotgun, shouting out a warning, or using less than lethal munitions does. The second is to determine your own mindset. Do you plan to survive the encounter or have yourself added to the list of victims that were tortured, raped, or killed by intruders who came into their home? To those that bring patterns into the argument I'd suggest measuring the distance from the defensive side of the bed to the entry points of the room and then safely replicating them at your firing range to test your pattern theories to solidify them or offer you time to sort out a different solution. Myself, I use #2 buck and my shotgun from under the bed is a Mossberg 590 like others who have posted before me. While you are at the range I'd suggest you also tinker with your angle of attack to help wrap your head around firing positions that would lessen the possibility of harming family members who are beyond your line of fire. I mention the defensive side of the bed as that is the place that I will be staying as I have been trained not to try to take the fight into an unknown enemy while I am still waking up and the mix of adrenalin with the fog of just waking make for a dangerous concoction. I usually stay far away from these types of conversations because I have a much different outlook on the situation than others. You see, I have in my possession a set of keys to a house that I sold that I killed two intruders in while I lived in Texas. So with that said people can post all sorts of smug empty headed nonsense onto the internet but I'll close with this. When in doubt about the safety of your loved ones and yourself, remove all doubt. Looking back, my only regret is that those two chose to attempt to victimize me and my family.