This is usually caused by excessive sizing lubricant on your case. If you are using a lube pad this is easy to do. It doesnt take a lot of lubricant, use it sparingly and try not to get any on the neck. I gave up the the water based stuff years ago and now use Hornady One Shot dry lube, it's not as messy either and comes in a aerosol can. For lubing the inside of the neck and good dry lube such as mica and Imperial Wax does great.


doubleA