I don't really see the point of the slugs either, honestly.
::Dons flame suit, clenches butthole::
I only have 3, and they're on the side saddle, but I do
have them on there.
1 - Covering distance. [Random example] - For whatever reason, my intruder knows I have a weapon, that irks him, so he runs out to his car, grabs a gun, and starts back towards the house. I'd rather not wait until he's in range for buckshot coming out of a smooth bore 18.5 inch barrel. Or let's take a page from the "Defend yourself in a riot like this" thread and say you've got a huge yard, and dudes are lighting Molotov's.
2 - He's behind something. He drops behind a couch, he's around the corner behind drywall, whatever. Maybe I could just wait for the cops, but if he's taking errant "reach his hand around the concealment and blindly fire" pot shots at me, I'd like the option to have something that stands a better chance of retaining higher lethality once it goes through a barrier.
3 - Armor. Nothing that comes out of a 12 gauge (at least that I'm
aware of) will go through good body armor. However, a slug is going to have a better chance of knocking him down, or at least stunning him, and mashing up his innards, while I take an extra second to properly line up a shot between his eyes. You know, I'm going to leave this up here for learning purposes, but the more I think about this option, the more I realize that if 2 rounds of 00 buck in the chest don't put him down and out, I'll just be going for the grey matter anyway, no matter what's in the chamber. Still, if you're farther away, your particular gun/load combo spreads quicker than others, and you need a solid hunk of lead to go through his brain, a slug is an option.
What's a better setup for these situations? A rifle. Some people don't have rifles, some have rifles, but don't have modern, semi auto, mag fed rifles, some wouldn't choose to use them for HD situations due to their living arrangements, etc. I'm not saying a slug should (or shouldn't) be the round in your chamber, I'm not saying it's good in most situations (I don't think it is, personally), but having a couple on there just in case gives you an extra option.
Edited, used the wrong word
I think he's also forgotten more about spelling and grammar than ... well it just seems he's forgotten a lot about it.
Few things are more win than saving the day with something that other people think you're weird for hauling around.