I can't add much to "that". But, of course I will.
I will say I hunted ducks, grouse, and pheasants from age six until thirteen with the cheap "classic kid gun" single-shot .410 still in my gun safe.
#2's for ducks, #6's for upland. An Iver-Johnson Champion. Gathered a lot of table food. You had better "Shoot Quick". And it WILL kill.
Then, a cheap ($92 mail-order) Win. Model 12. 30 inch full-choke barrel in 12 gauge. You had better wait a while if you wanted to eat the bird.
Anybody who has ever bird-hunted knows they are easy to bring down with minimal bird-shot "hits". If the gun doesn't kill 'em, the fall from a wing fold will. Usually.
The shotgun standing "handy" to my bed is a plain-Jane Mossberg 500 short barrel with cylinder "choke" eight-shot.
There is a reason I bought a 12 gauge instead of a .410. Or even a 20 gauge. No reason to skimp if a SHTF ever happens.
And no, I don't give up the 8th shot so I can "pump the action and scare off any bad guys". That is just terminally stupid BS. YMMV.