From the Dillon forum https://www.dillonprecision.com/power-coating-press_350_12_1386.htm
RE: POWER COATING PRESS?
January 9th, 2012 at 7:36am
The earliest RL1050s were electroless nickel plated. After we found some lubricants caused the nickel in the crank to peel, we changed to a parkerized finish. Powder coating would be fine, except for the top of the frame where the shellplate rides. Thicknesses in powder coating are too viriable for that location.