OK, we all know that the E-Trac is a killer on the silver coins, so I have a question in regards to something from Andy's book.
Andy says that while the Co number will stay basically solid, the Fe numbers can raise as the depth of the coin increases. All the way up to an Fe of 27. This is the reason for the pattern he uses. I don't think I have seen numbers change very much at all, but I know that each site can be different.
What has been your experience on deep silver? Do the Fe numbers raise that much?