Thread: 20g ammo advice

Fellow shooter with me on a trip back in the 90's to shoot a smaller species of deer (cant say where) had a Winchester pump and put 3 rounds at/in it of buckshot before it dropped.
From memory it was the defender model and if so it would've been a very open choke so not so flash maybe. No further than 20 yards I believe.
Why do the Americans love them so much? Must be tight bloody scrub to get the best out of them. I also realise that they shotgun only seasons and some of the new slugs that are being brought out look truly devastating.