Nice pot, I'm thinking about upgrading to a pot with a PID as well next year, not sure which one I will go with yet. NOE makes a nice mold guide that will fit either the Lyman,Lee or RCBS.

http://noebulletmolds.com/NV/product...81pdufnbjuft95

Install video.
https://www.youtube.com/watch?v=lQt1y4TiHRA

Lee 4-20 pot, you will need the adapter to use with the guide.
https://www.youtube.com/watch?v=V-NqAvYcFog