Barrel rifling was invented in Augsburg, Germany at the end of the fifteenth century.[5] In 1520 August Kotter, an armourer of Nuremberg, Germany improved upon this work. Though true rifling dates from the mid-16th century, it did not become commonplace until the nineteenth century. Wikpedia.Smooth bores can take some trial and error to find an accurate round ball load. Some like a "standard" patched round ball load and some shoot better with wadding. (thick over powder wad and thin over ball card) You can expect typical accuracy of 2-3" at 50 yards and I know guys that can take deer with regularity out to 100 yards. People who say that you cannot hit a barn with a smooth bore, if you were standing inside it have never shot a smooth bore with a properly developed load.
All I know is... I bought a .44 mag..... Why use a muzzleloader, when you can use a rifle????? And... don't give me the primative mumbo jumbo.... modern muzzle loaders are very efficient.... just like a rifle, so ya might as well use a rifle....
I really like my T/C Encore. The inlines offer better performance than traditional muzzleloaders and you can get wood or synthetic stock and you can change barrels to other calibers for other uses.