I have used Lee, Lyman, Pacific, & RCBS dies. Lee dies tend not to be as well polished as are the others. If you clean the inside of the die and examine it under a good light...see how smooth that it is inside. Getting a replacement die from Lee will probably do no good as it too will be rough inside. I used two steel rods and built up with masking tape to fit snugly and polished mine with 400~600 grit sandpaper...one for the neck area and one for the body. I spin with a slow electric drill. You will not ruin the die or make it too large inside with this method. You merely polish them out. Petrol & Powder makes a good point....it maybe best to buy an RCBS or Redding to avoid having to do this, but it would be simple to polish out your Lee dies and they will be just fine.