It sounds like you're referring to a specific resource or document titled — possibly a catalog, artist's book, or research paper.
Private castings are casting calls that are not publicly announced or advertised. They are usually organized by talent agencies, casting directors, or production companies looking for specific talent for a particular project. These castings are often by invitation only, and participants are typically selected based on their previous work, experience, or suitability for the project. private castings x 30
Outside of media, "castings" and "private" appear in manufacturing and finance. Electrosteel Castings Limited It sounds like you're referring to a specific