The subtle radius of each shell holder mouth ensures smooth and reliable functioning. The retainer spring is designed to stay in place when inserting cases into the shell plate. #16. Fits: 17 Rem, 17 Rem Fireball, 17-222, 17-223, 20 Tactical, 204 Ruger, 220 VT, 221 Rem Fireball, 222 Rem, 222 Rem Mag, 223 Rem, 5.6x50 Mag, 6mm TCU, 6mm-223, 6.5mm TCU, 7mm TCU, 7mm-223 Ingram, 7x47 Helm, 380 Auto and more. For a complete list visit Hornady's website.