I would way rather have a 20 pound pot than a 10 because in a 10, when you add lead it will cool down much quicker and when you wait for the lead to get back up to temperature your mold will come down unless you have a hot plate and even then the mold might get too hot or not be hot enough. It is an added expense but I use two pots and take melted lead from the second and add to the one I am pouring from so I never have to stop. If you use any of the Lee pots put some weight on the handle that dumps the lead so you will have better contact and less drips. The only difference between the Lee and an RCBS for drips is the RCBS puts more weight on the valve and you can twist the Lee valve but can't the RCBS.