What a lot of folk's today are forgetting is the early barrel's were wrought iron,and inheriently soft. When they were "shot out",it would cost @ .50 cent's to ream smooth,or $1.50 to re-rifle. At the ranges we shoot,80-90yd's max,it wasn't worth the extra dough to rifle the barrel!
I have a couple of "Smooth Rifles" both built in the Southern Mountain style. 1 is .50 cal,and the other is .40 cal. I'll shoot against anyone with either of these gun's on a wood's walk. Paper target's,not so much. They are VERY good at killin' dinner!(shot OR round ball)!