Got a new 77 in 30-06 this fall. After 60 or so rounds I noticed the inside of the barrel at the muzzle was green with copper fouling. Never had a gun copper foul that quickly. Cleaned it with J-B compound and took all the copper out, however, during the inspection with the bore light I can clearly see the inside of the barrel looks like outside of a ring shank nail. Never seen that before. It has the normal rifling but rings for the entire length of the barrel. Anybody else ever notice or have any experience with this before? Haven't called Ruger yet.[/ATTACH]