Yes, you are taught how to clear corners. The problem is, in a home with tight hallways that's hard to prevent while staying keeping an alert stance, without having another person to cover you. But hell, if you got a husband and wife team sweeping that would be bad ass.

And you're correct, birdshot will most likely go into the next room. But it won't go through multiple rooms and possibly into a close neighbor.

Agreed that's pistols take much more skill, but I stand by them as the best home defense weapon if you're able to train. A revolver specifically.

Anddddd you sold me on the claymore.