There are nasty people on the internet that sometimes give bad advice and want YOU to get hurt.
Paul82,
This is not your little brother's Internet. This is THR. We don't play those games here, and anyone who tries it gets shown the door. We won't even put up with excessive snarkiness, most of the time. 8^) You can get different opinions here, and arguments, good advice and bad advice. But not a lot of dangerous advice gets by both the staff and the membership here.
It's fine to shoot ANY commercially available slug load in your shotgun,
so long as the gun itself is safe to shoot with modern shotshells, and you properly match the length of the shells you buy to the length of the chamber. It doesn't matter if you shoot rifled slugs, or sabots, or even if you shoot
EXTREME SHOCK! unobtanium slugs in it (no, I'm not kidding- but don't waste your money on exploding pants advertising -
http://www.extremeshockusa.com/ ).
But your best bet for a smoothbore barrel is going to be rifled slugs. If your dealer has them, try Brenneke KO slugs (not the sabots)- they're usually less expensive, and have worked very well in every shotgun I've ever tried them in.
Sabot slugs are for RIFLED barrels, and usually cost a bunch more than plain old Foster type or Brenneke rifled slugs. You won't hurt anything (except your wallet) shooting sabot slugs in a smoothbore barrel, but you probably won't get very good accuracy results either.
And a couple of hints: Don't bench rest a shotgun with slugs like it was a rifle, shoot it standing from a padded rest. Shooting slugs is no picnic, it's a good way to build in a flinch from recoil if you don't have your shotgun form and gun mount correct.
Stay safe,
lpl