Steel shot bounces back whereas lead deforms on impact
Depends entirely on what your target is. Against steel yes. People and interior walls are generally not made of steel.
I really think that shot size is irrelevant in a 12 gauge shot gun in a home defense situation. I would feel confident with any load at those distances and hopefully be aware of what lies behind the walls.
If you've watched any of the videos posted, then it should be readily apparent that shot size matters.
Yes, any of the rounds mentioned will win you a gun fight.
Virtually every defensive firearm instructor will tell, and every anecdotal use of DGU I've ever seen shows that the first person to score a good hit on target will almost always win.
There are two ways to win. Kill the attacker. Degrade their combat effectiveness to such extent that they determining they need to quit in order to survive.
Any shotgun blast at close range, even with rock salt, will degrade the combat effectiveness of any person. Even a blank at close range throwing nothing but burning powder can neutralize a threat.
Most of these videos seem obsessed with stopping power, as if that is the only factor that matters. You are discharging a firearm inside your house with no ear protection. Firing a 3.5" 00 buck shell, as some recommend, is about guaranteed to deafen you, which is not going to help you shoot move and communicate with other defenders.
Bill Burr did a great sketch on why .22 lr for home defense is perfectly reasonable, and while he is a comedian, most of his points are equally relevant to choosing a very soft shooting #9 birdshot over a heavier load.
I don't see any reason to use birdshot, unless that's all that you have.
In my experience, and that of some folks that I talked to that used it in anger, even #4 buckshot is a bit light beyond a short distance.
Ultimately the question here for everyone to answer, is what is your preference, and what is your risk tolerance.
You have two main directions you can go.
1) choosing a single ammunition that you intend to use for all applications. Close, long, inside, outside, Aimed shot, instinctive shot, clean shot, high traffic shot, etc. In chosing a single ammo, you are necessarily accepting that you may find yourself in situations where you may have the wrong ammo, and may need to affect your decision making accordingly. There may be some shots that you just can't take due to fear of collateral damage.
2) Choose multiple ammunitions for different applications. In choosing multiple ammunitions, you are giving yourself a greater range of options and probably better ballistic performance for a specific application, but you are adding complexity to your response, and also adding a measure of risk that you could use the wrong ammo on the wrong shot.
You can train for option two, and significant reduce your risk of making an ammunition error, and to decrease the time associated with pre-emptively changing ammo type in the chamber.
Not much to do with option 1 other than to hope that it all works out.
Each course of action is a perfectly reasonable option, and will depend on a variety of specific factors.
Personally, I choose option 2. I don't have long shots in my house. #9 birdshot will significantly degrade the combat ability of anything that takes a direct hit, and used in conjunction with a 14" barrel will not penetrate into any adjacent room. If for whatever reason my fight goes outside, I have 00 buck and slugs available. The idea being as soon as i am outside there are no walls to concern myself with, and as such before going outside, I know to change ammo selection. Since I don't forsee any reasonable scenario where I would be in hot pursuit of an attacker from inside to outside, the risk of forgetting to change over is low.
It’s better than nothing and certainly not something anyone would want to be shot with, but why advocate for something that is not meant for its intended purpose?
Birdshot is made for.........birds.
"birdshot" is a marketing term. Who exactly gets to decide what something's intended purpose is?
personally I advocate for using #9 lead birdshot indoors in home defense applications because of science.
I understand. However this just advocates, or enables if you will, poor planning.
I would argue that the firearms act is probably more reasonable for advocating poor planning than anything else, but I digress.
This...If you watch the two vids I posted earlier in the thread he talks about the need to be able to have useful stopping power at the longest distance in your house, for me that's about 20yds from master bed doorway to rear entry. Also the effect over that distance or even much less of spread and possibility of hitting someone unintended with some of your pellets.
What would you prefer to have if the intruder was holding one of your kids as defence? Like he found in those videos the best compromise is likely some version of the flight controlled #4 buck.
Thats some house you got there. Longest straight shot in my house is 35 feet, and that is through two open doorways that aren't normally open, and are made of solid wood when closed.
As for the second point, I'd prefer to have an AR if I was worried about a hostage situation, but at least if the attacker has my kid, I know where my kid is and i am far less likely about them being on the other side of a wall without my knowledge.
Another big factor in this whole penetration thing is the layout of your house, the probability of over penetration even mattering, who else you live with and where they sleep, and lastly, how much you love fixing drywall.
This is why there is no one perfect answer that fits everyone. It shouldn't be a job to tell people what the best is. We should be looking for factors that should be considered and understanding the variables influence the right choice based on those factors.