It may still shoot and may smooth out with use. The thing about the stock barrel is that it has shallow button rifled grooves and a "compromise" 1 in 48" twist which is too fast for optimum patched roundball shooting and too slow for optimum bullet shooting.
The aftermarket barrels feature no compromise patched round ball twist rates or no compromise bullet twist rates if that's what you want.
I shoot offhand muzzleloading rifle matches mostly and I replaced my stock .45 caliber barrel with a .36 caliber Green Mountain patched round ball barrel and never looked back. These barrels have bores that are so polished that even a bore sized roundball surrounded by a patch just slides downbore with gentle ramrod pressure once started.
The firing line at Friendship is full of TC Hawkins with GM barrels in them.