I see it like this...
Birdshot
might work at point blank distances in a self defense situation. Buckshot or a slug
would work. Buck and slugs aren't costly or scarce.
Why would you choose to use birdshot instead?
A lot of state/city prosecutors like to portray the home defender as a blood thirsty gun nut using killer loads that the military uses to kill terrorists as a description of the homeowner to the jury especially if they used a "tactical" shotgun with a short (18½"
"barely legal") barrel.
That the homeowner only wanted to kill someone--why else would they have their guns loaded with killer rounds next to the bed, just waiting for someone to break-in.
They are killers and even got training at gun clubs and shooting ranges where they went to practice their deadly art by shooting hundreds of rounds each month--actually they had attended a Cowboy action event or a three gun shoot.
By using such a heavy load, one that only police should have in their guns, the defendant only wanted to kill--where if they used a smaller shot the son of this distraught woman would still be alive today.
OR WORDS TO THAT EFFECT!
I, just a layman not an attorney, just turned everything around so that the defendant is now viewed as the blood thirsty murderer instead of a victim of the crime.
Read some of the NRA-ILA or Massad Ayoob articles about what the prosecutors can and will do and have done...Especially NYC, Chicago.
New Jersey is claiming that the use of hollow points are murder weapons that only felons possess and their use in P/HD is forbidden.
Shooting them with birdshot (#BB) at 5 yds is a lot easier to defend as everyone has heard about "buckshot" and its deadly powers...Everybody knows that birdshot is for the little, itsy bitsy birdies and could never hurt anyone.