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Which also means it will penetrate more than a .357...Unless I lived in a rural setting with no close neighbors, and no children, I would never use a slug for home defense in a shotgun. They over penetrate...period. If I was going to use a shotgun for home defense I would use bird shot. It may not be the most lethal round but it will not penetrate much. You would be better off with .223 TAP or something than a shotgun slug.
Actually, it penetrates less.
Box'o'Truth is down at the moment, so I can't post a link. But yes, it penetrates less than necessary for a bullet to be effective at incapacitating a criminal. Believe it or not, the 00 buck pellets actually have better sectional density, though they are going slow enough that they aren't that great either.
Bottom line is that a .410 isn't a very good defensive caliber in any platform. 20 gauge has minimal recoil, and can be had in large enough shot sizes to be effective.
Yep, that tiny little slug doesn't weigh anything, and is pretty much a hollow "U" shape, like all shotgun slugs. It's also dead-soft lead, so when it hits it flattens out and only penetrates a few inches. You'd be better off with a pistol round.
If you're going to use a .410 for home defense, you want to use buckshot. You'll only get 3-pellet buck in the Saiga.
Will it work? Yes...
Is it a good choice? No! There are much better options out there!
Countless little old ladies have successfully defended their homes with old single-shot .410 shotguns...will it work? Yeah, probably, it is a gun afterall...is it a good choice? NO! There are much better options out there.
Like a Saiga 20 or 12 gauge, with BUCKSHOT.
A compact semiautomatic carbine is pretty much your best bet.
Like others have said,
all rounds that penetrate deep enough to reliably stop an attacker will penetrate
several interior walls. That's physics. There are no magic bullets.