Can't agree with this. Inside of 30ft (reasonable assumption if you're shooting inside the home) birdshot is quite fatal, especially 12 gauge. Out to 75ft it's really going to fuck up your day, but much, much less reliable.
With training and practice, absolutely agree. But I've found overwhelmingly that shotguns are more approachable, especially for women, even though I consider an AR personally simpler. Recoil however is a function of weight, and something small like the Rattler, even as heavy as it is for the length, has a lot more kick than an M4 with a 16" barrel.
The.410 recoil is also very reduced while still being a fuck-you-up machine at close range. Personally the 12G recoil isn't an issue for me, but for my wife it's a huge difference. But like I said, to each their own.
This is my concern, and it's been shown in gel testing. Problem is, gel testing just isn't as transferable to actual flesh and bone testing, especially at the fringe. I'd wanna see some actual testing on pig corpses (or living pigs) to know that a specific subsonic 300 out of my 6.75" barrel will actually expand.
147 grain 9mm, however, will perform as expected out of the pistol-like barrel of a PCC, and will be pleasantly quiet with a can on it. It'll still go through drywall if you miss, but you don't have to worry about it zipping through the bad guy and the wall behind him like an unexpanded rifle round.
But there's also a ton of research showing that the penetration of the different calibers ends up being the same if the rounds expand correctly. Similarly, the belief that 5.56 won't go through much drywall because the bullet is so fast it breaks apart isn't supported by testing.
But there is one round that is meaningfully slowed by drywall... Birdshot.
I think the conversation surrounding shoot to kill, shoot to neutralize, and shoot-to-disarm is not particularly clear in a lot of gun owners' minds. The number of people with punisher logos or "you're fucked" etched in the dust cover supports this...
Obviously shoot to disarm is retarded, so we'll leave that to Joe Biden. But in home defense I am not shooting to kill. I am shooting to neutralize. They look the same because in isolation I'm using the same ammunition and aiming at the same body parts for both, the only difference is there's only one way to be dead and several ways to be neutralized, and I'm fine with any of those ways to be neutralized. And yes, birdshot is absolutely less likely to neutralize than 556, or buckshot, or pretty much everything else.
But if I can pick a round that will still have a high probability of neutralizing the intruder, while reducing the likelihood of collateral damage, that's a trade-off I'm interested in researching further. Again, I'm going to aim the gun at the exact same body parts of the intruder, and I'm perfectly comfortable if death is the resultant means of neutralization, but especially considering that the house I'm building uses both slightly thicker drywall and cavity insulation in the interior walls of the bedrooms, I will have a setup where where bird shot absolutely will penetrate less than any other round, while still making disgusting bloody holes in the bad guy.
Again, many variables, but I think bird shot is dismissed too readily for the specific scenario of family defense in an American-built home.
Also, I like that racking a shotgun signals to someone that I don't actually want to shoot that they should announce themselves immediately. It's more likely the intruder isn't an intruder at all where I live in Texas suburbia.