The Forster Classic Case Trimmer Collet is available in four different options including #5 #6 #7 and #8. All of these collets are affordably priced and built to last. Using the #8 as an example a reloader is required along with the Forster Classic Case Trimmer in order to trim specific cartridges. One note: This collet is not designed to work with the Original or Power Case Trimmer. As far as cartridge sizes for the #8 these include 280 Nitro Express Rimmed Flanged 38-56 Winchester 40-65 Winchester 40-90 Sharps Bottle Neck 45-100 Sharps Straight 45-70 Government and 45-90 Winchester.