If you are getting vertical scoring marks (not faint ones really fat ones) on your case necks even after annealing take your bushing die and inspect it closely you will probably see brass build up on the inside dia.. I am sure this has already been discovered and is known by many experienced reloaders just thought I would remind everyone! I just use KG-12 copper killer to remove build up and throw the die in my ultra sonic cleaner works like a charm!
