Quote Originally Posted by kelbro View Post
Please elaborate. I have been using them for years to create very concentric brass and never had to deal with a donut. Combined with annealing and a Redding body die, I don't see how you could get much better. My seating tension is uniform, my verticals are incredibly tight. Much better than when using bushing dies.
How do you know your brass is concentric? How do you know your setting tension is uniformed? what is the AVERAGE group size your are shooting? You might be surprised how much better it can all get.