I looked inside a Barrell yesterday,16 years old Green Mtn barrell.The breach plug was pulled so I had a good look with a light too.The muzzle end down about 2/3's of the barrell looked perfect.Just like it had been polished over the years.The breach 1/3rd looked like it had some roughness in the grooves.There was an obvious "Ring" where the Ball sets(I am assuming that just from repeted use with the same powder charge)Does anyone know if there is roughness in the grooves of a new Barrell?It seems to have started ripping patches lately.Anyone got any observations?