As have I. Three molds, so far.
He will machine the correct size block depending on the caliber and type of slug, plus number of cavities, that you put down on the order.
Ask him what is the optimum configuration for what you want. The catalog can be overwhelming, with lots of choices and different weights or grooves, etc. Let him know what you're going after in the design. General cowboy shooting, target or precision shooting, plinking, hunting . . .he has designs for them all. Black powder or Smokeless? Also, may help to slug your barrel(s) to get an idea of diameter you should be ordering.
Excellent products. And be patient. He is reliable, but kept busy. Quality sells.
Mold bodies are not huge blocks of metal. You want to be able to get them to proper heat quickly so as to keep a steady rythum when bullet molding day comes. Aluminum is a good choice. Be sure to "candle" the interior before cast. Putting a light layer of soot smoke from a poorly trimmed candle wick acts as a mold release.
RCJ