You can shoot it thru the barrel but long term the plastic and lead residue might be a bit much to clean up.
I've never tried buckshot out of a rifled barrel, but I've killed a few truckloads of deer with buckshot out of a smooth barrel...It's deadly, just have to know what you are doing...
Didn't kill a truckload because where I lived did not have liberal gun seasons..2 deer a year max but it was a deer folder supreme.