If you are experiencing issues with reloads chambering tight or not at all, make sure the die is making contact with the shell holder when you are
sizing the case. The head space is set when the die and the shell holder make contact during sizing. I would also suggest that you check the sized cases in your chamber before loading. It may not be the sizing that is the problem. And last, make sure you are using a good resizing lube, not spray lubes. We recommend Lee Resizing Lubricant
You are welcome to return the full length die, with a sample of your case fired in your rifle and sized using this die, and one case that
has been fired in your rifle and not sized.