RCBS die question

[Huckster]

Ive been loading ammo for 22 years and produced thousands of rounds in various calibers during this time. I have only loaded about 100 rounds of 204. The RCBS dies have worked flawless since I bought them. I have not loaded any 204 in the past year.
Today I began to work on some brass. All cases are hornady. Using the resizing die I get a ring on throat of the casing half way between the mouth and the shoulder. I tried to adjust the die up and down as well as depriming rod down. The ring appears on each case. I dont understand why I cant adjust this ring out. I even wiped off the oil on the casing but this still does not help. Like I said, I have used this die previous to this without issue. Any suggestions??

[inKYfromSD]

Does the ring move when you move the die? Have you cleaned the inside of the die? Take it apart and clean it with a degreaser. I use Hornady gun cleaner and dry lube. Alcohol will work too.