Yea me too. I run my brass in corn cobb media for at least 24 hours before resizing so they are clean and shiny. Just with neck sizing, you have a brass that is nearly a perfect fit for your chamber which is a positive for accuracy and consistency, but possibly could result in a hard to close or unable to close bolt if even a tiny amount of anything gets in the chamber area. At least that is my thought process. I have not been reloading anywhere near as long as many on this forum, however.

Thanks