Bird shot will work very well for the tactical situations it's advocates have created in their own heads.
It must, since it seems to have a fair amount of fans.
Add in the real world, reality based tactical problem ivolving Bubba and his friends using your favorite armchair or other furniture, etc. for cover-- that bird shot won't defeat-- then it doesn't compare to 00 buck, which is proven and uncontroversial with re: to it's effectiveness on Bubba the intruder.
Or any other type of feral man.
Never understood those who go to birdshot to reduce the danger to members of their own family (and other innocents) and then try to tell us how lethal it is against an assailant.