So you understand how birdshot is different than a FMJ? A pellet isn’t going through 3 walls, a FMJ is. There is massively more penetration and lethality after penetration. Have you ever shot a gun?
And yes a shotgun is much easier to use, are you crazy? You need much much much less accuracy. You literally can just aim down a hallway and get great coverage.
Nope, use shotguns and understand how different chokes can impact spread.
With no choke I would expect a 2 inch spread at 10 feet. 2 inches is a lot of grace in a life or death situation.
Yes it has a lot of recoil, but in reality you’re not getting into a shoot out. You’re shooting once, maybe twice, before the encounter is over or into a scuffle.