Never had much luck with rifled slugs. Think I can shoot my bow better at 50 yards! Rifled barrel and sabots a different story! Though the price they are asking for a rifled shotgun barrel you would be better off buying a .308 Ruger American from Carp'2. Even most beat up old 30-30 Marlins from Cabela's used rack are deadly bear medicine to 150 yards!
But you change that stand location you might end up shooting a bear with your gun at 15 yards! Seems nearly every time I ditch the bow for a rifle I kill something at less than 30 yards. I built a long range 7mm as a class project in highschool metal/gun shop class
(obviously that was a long time ago!) I shot two bear and a deer with it before I sold it. I think the combined total distance was less than 80 yards

Dang it if you do. Dang it if you don't!