I believe your (every) bullet seating die not only reshapes the brass case back around the bullet but it does a minor chamfer operation. Both of these processes will scrape a very very small amount from around the neck in order to get the neck to seat tightly around the bullet.
I believe this is where your brass particles are coming from, and by the way this is normal.
"A man can never have too much red wine, too many books, or too much ammunition"
Last edited by Kentguy; 11-05-2012 at 05:34..