Ok guys I will try to give you all the details you may need without killing you with the ones you dont. My Dad had a Rem 700sps in 300WM. We got tired of trying to get it to shoot so we bought him a sendero. We had 100 pieces of WIN brass (shot twice) I had just learned of the value of checking for neck run out then bullet run out. Since we changed guns i had to FL size the brass. Had FL all the pieces when they were brand new then had just used the lee collet neck die after that.(the FL die is also a lee) The problem is when i FL sized the brass the neck came out in way worse shape than it went in. It was +/- .002 when it went in and came out .005-.007 out of round. I made sure the die was set up according to the directions even tried running them back through the neck sizer and some were corrected a little but never where they needed to be. It may just be the quality of the lee die. I trimmed this brass so that is not the problem. What do you guys think?