Do the resized cases fit into your rifle's chamber OK, or are they also a tight fit in your rifle's chamber? If they chamber OK, then I would suspect that the WFT is out of tolerance. If they are tight in the WFT and your rifle's chamber, then I would suspect that the Lee dies are out of tolerance. If you suspect the Lee dies, then you may want to try a small base die such as:
http://www.midwayusa.com/product/205...-223-remington
Hope this helps.