RCBS Rotary Case Trimmer Pilots were designed specifically to be used with the RCBS Rotary Case Trimmer. The RCBS Rotary Case Trimmer quickly and efficiently trims away excess brass to ensure maximum accuracy in your reloaded ammunition and RCBS Rotary Case Trimmer Pilots are what you need to make sure your cases are trimmed properly for the appropriate caliber. RCBS Rotary Case Trimmer Pilots come in a variety of sizes for all of the most popular cartridge case calibers. This pilot features a tapered head that smoothly guides the pilot into the case mount and holds it in place for trimming.