Well, I would certainly never consider using it at any real distance but I don’t think a load of number eight at ten feet would be anything to be happy about. I’ve got a few birdshot shells along with some buckshot, maybe I’ll do my own test. As far as loading a pistol with it I would not even consider it.
There’s no reason to try birdshot.
It makes no sense. #4 buck or better, period.
There’s no reason to try anything less, or hope, or guess.
We know that buckshot is best. #4 buck is the smallest effective shot if over penetration is a concern.
The best overall shell for home defense is Federal #1 buck with the FC wad.
Next is plated 00 buck.
Since the #1 buck is often hard to find, by default the best available shell is 00 buck.
Why would anyone experiment with rounds that are likely to be ineffective when lives are at stake?
Especially when proven rounds are readily available?
You have to aim the shotgun anyway, so why use bird shot? Aim like you should, and hit the perp hard, with buckshot.