I have a 1022 target model with the standard Ruger 1022 target barrel. Gun is maintained well, etc. All of a sudden, accuracy seems to be off. When you pull a brush through it, it is very strange. As you start out from the chamber end, there is the usual resistance. Then, suddenly, in about the middle, there is virtually none. It is almost like it is perfectly smooth, for about an inch or so. Then, the resistance picks back up for the rest of the barrel. Gun has been scrubbed, have used electronic cleaner on it, for both lead and copper, etc, and yet it continues. Anyone have any thoughts as to this or heard of it before?? Thanks so much.