Today, 05:46 PM 
Before removing any material from the mandrel, make sure the collet isn't stuck. What you mentioned are the exact symptoms of a stuck collet. Take the die completely apart (everything comes out the top). Put a drop of oil or grease on the outside of the collet fingers. Reassemble. See if it'll work then. Check the instructions (bottom left on the instruction sheet - "If collet dents cases it may be stuck"), only don't hammer on it like the instructions say. Take it apart!! I understand yours isn't denting the cases, but diassemble, oil, and reassemble anyway. You'll be done in 45 seconds. Put 25 pounds of pressure on the ram handle when sizing, first ensuring the die is set up exactly as Lee's instructions say (Put shellholder on ram. Raise ram. Screw in die until shellholder just kisses the bottom of the die. Lower ram. Turn die in one full turn. Lock it down).
Is that die marked for 22 Hornet? If so, an oversized mandrel is possible but not probable. After following above and freeing the collet, polish it like others said if it still won;t size correctly. Remember the minimum 25 pounds of ram handle downward pressure first.
The way the collet gets stuck is, when the die is screwed in, raising the ram up to the die without a case in it. This pushes the male collet up into the female, and can lock the die where it won't work. THe die is correct if the bottom portion of the collet, sticking out from the bottom of the die body, spins freely with a little slop. Some collet dies will spin like there are ball bearings inside! Others are a tad tighter. All will exhibit some slop. The slop is not faulty machining - it's designed that way.
Good luck!
__________________Stretch ?
"If you are a reloader and you don't know Lee, you don't know Jack" - Floydster
DON'T BE SCARED?
Last edited by StretchNM; Today at 06:00 PM.
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