Redding case forming dies are designed to shape the parent cartridge (original case) into the desired case by changing the brass in small increments. This method avoids overworking the brass and helps prolong the case life of the finished product. After using all the form dies and form and trim dies required, it is also necessary to full length resize. In the drop down box are a few forming dies that we stock. Please see the Redding catalog for a listing of form die sets available, plus form dies available as custom dies. We can special order all other form dies that Redding has available. Mfg: Redding