Box of truth misleading
Well I am going to wade in on this one.
I will say from personal experience Bird shot is brutal. We are not talking dry wall boards we are talking skin and flesh. If in your home and shooting a shotgun it is devastating. Granted for the all around task, buckshot is very hard to beat, so it is the preferred for police work etc.
Lets take the average room in a house and shoot at something. Problem is the house will need to be fixed so...
Lets do this, take a 3lb plastic large mouth container like the ones that have protein Whey in them. Or get a watermelon. The thing is you can put a few pieces of wood in the container to resemble bone material, a few tennis balls to resemble organs, along with water and jello. The idea is to have some strength on the outside so it will be like a leather jacket or ????...
Let it sit for some time to let the jello jell (refrigerate is better). Then put it at about the distance of 15/20 feet or so and shoot it with #8s. Granted 20 feet is quite a far distance if you want to think about the average room in a house, but it will give you the idea.
At 5 feet it eats holes as big as your fist through 1 3/8 solid core doors. A simple drywall wall is destroyed. Some of it flys back at you so beware. Better stand behind a piece of 3/4 ply or thicker and have two small holes in it one for the barrel and the other for your vision (safety glasses on and ear muffs)...
If it does that to doors and walls where do you think all the flesh and bone goes?
Penetration is fine on car side windows, they just dematerialize. Get realistic and try the test I have said. You will be very surprised.
When going into the brush after live dangerous softskined animals #4 or #6s was the preferred for some of the big game hunters. The distance can be as close as 5 or 8 feet and it is so brutal in that circumstance, the ones who were in the know picked small shot to buck shot. But under those conditions bird shot is not as effective, but neither is a slug. This is my experienced opinion.
Harley