I am not sure if the trimmer numbers and the press numbers correspond. shaynster is looking for the shell holder number for the case trimmer, not the reloading press. I am still not positive on the #20, because I could not tie it down to the 460 S&W specifically. Chappy is correct that with the loading data, that the #14 is listed. You could always call RCBS to find out for sure. Their Customer service is outstanding.