Quote Originally Posted by Bret View Post
Do this to start. I have the exact same die set that you're using. I use a case neck brush sprinkled with dry mica to help the expander ball go through the neck with very little force. Try this and see if it works. I've loaded tons of cartridges and am very happy with the results. If you find that you're not happy with the results, then move on to something more involved.
On 5.56 I use One Shot spray lube (if you use it correctly, it WILL work every time). I make sure a little gets sprayed inside the case necks, and I've never had a problem with either sizing or expanding, using a plain old RCBS set.