The rifled barrel is great if you want to shoot sabot $lugs out of it.
Otherwise, it's pretty much useless for anything else, including HD. The last thing you want is a big doughnut pattern spewing buckshot everywhere except where you aim.
If you don't intend to shoot sabot slugs, trade / sell it and get a smoothbore.
+1 this trade is usually pretty easy to do. With some smooth talkin', you might be able to get an 18.5" smooth bore for HD and a 28" interchangable choke barrel for little money added.