Quote Originally Posted by BPTactical View Post
It appears that this barrel was recrowned.
First guess is a non piloted crowning tool or a piloted one that seized up.

Curious what your thoughts are Mark.
Your first guess is what I thought when I saw it. I guess it is possible it was made that way, but some research on the gun make would reveal that. I know there are muzzle loaders that are rifled, and then the last inch is back bored and they don't seem to lose accuracy.